Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c7d23548f81f5…

MALICIOUS

PDF

44.6 KB Created: 2020-10-28 04:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fdcb2979a8c0839b49db37dcd706e95c SHA-1: bb56f3963a18d01eb852119879aa464fdcd001b6 SHA-256: 175c7d23548f81f58734f18c6a696965a4a88b0f82d4f6d8f026cc7247615ffb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and flagged as redirectors to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The heuristic firings strongly indicate malicious redirector and link farm activity, suggesting the PDF's primary purpose is to drive traffic to potentially harmful sites.

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://ggtraff.ru/strik?keyword=christmas+brain+teasers+printable+with+answers In PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/d79728d24.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/c713c.pdfIn PDF document text
    • https://watinadapazibe.weebly.com/uploads/1/3/4/4/134492378/xekifotizolek.pdfIn PDF document text
    • https://mapuxotegudu.weebly.com/uploads/1/3/4/3/134356271/maboza.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/d76fc543c9bac.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/cd97289c6.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/viwaz.pdfIn PDF document text
    • https://tinijaxiri.weebly.com/uploads/1/3/4/4/134440903/gafesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/datiligosukobesokarenewo.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/cv_malli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a312b84-8c37-4888-81a4-68f76688396a/63077771451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f48dbc-5d62-49dd-95c3-900a61e784cc/epidemiologa_clnica_laura_moreno_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef09e22b-f7e0-4109-860f-b35ac8349e1f/legado_de_los_toltecas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1541/2632/files/brunswick_city_schools_supply_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/5597910998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/latest_qatar_labour_law.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/bidufuvanezedivala.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_off00006dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAE 5196 bytes
SHA-256: 4395fcf958dd411cc2996c28ec3a1848c07710e89eb51e24e2ba94757c21a376
font_01_sfnt_off00007f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3F 11068 bytes
SHA-256: 0e3b5ff52ec26954cc46d53310e9f3df72059348ddb9f5d0ba8f8eb5c3ff7aa5

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