Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a6ca0882885ebc…

MALICIOUS

PDF

42.8 KB Created: 2020-10-15 09:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0792b1cecb73f523a069a3a4cfed5ac SHA-1: 7ea3ebb08598539dca5617e9098a3b5020088050 SHA-256: 56a6ca0882885ebc55fbd406de24785b578f7c6f1187127f85498a7ee372226f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation. One prominent link redirects to `https://cctraff.ru/strik?keyword=perkins+4+cylinder+diesel+engine+manual`, which is flagged as malicious redirector infrastructure. The document body, though partially obfuscated, contains references to the malicious URL and other PDF links, suggesting an attempt to drive traffic to malicious sites under the guise of providing a technical manual.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=perkins+4+cylinder+diesel+engine+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f873fd0463c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f873ce5736b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87139baaa63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f87829332de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f87a4dec5489.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/xowevekufiserur.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/9fa7699.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/7128879.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/govorikepudago-gixidawele-wawep-xoxebilepadevu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kadupe_ripovu_jozovagazemewe.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/zegabileniwiv.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/6323409.pdfIn PDF document text
    • https://site-1042198.mozfiles.com/files/1042198/rusogubeledevetixaj.pdfIn PDF document text
    • https://site-1044200.mozfiles.com/files/1044200/baxakarevisib.pdfIn PDF document text
    • https://site-1040896.mozfiles.com/files/1040896/31278619708.pdfIn PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/jovakulalatakuzux.pdfIn PDF document text
    • https://site-1042731.mozfiles.com/files/1042731/holistic_assessment_in_nursing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0912/4763/files/weddington_middle_school_canvas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/67047365476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/apalachee_high_school_baseball.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5512 bytes
SHA-256: 988c5e9b3d31281c6c25b48bd540cd3c02ddda4fea68e9890d5dac06a534cfaf
font_01_sfnt_off00007acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACD 10156 bytes
SHA-256: 2c4002041acff19e89d28f40b90f1bfce735cf84841e4c9a54329c2d7bb73271

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