Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1c1770f24a5cbf…

MALICIOUS

PDF

45.0 KB Created: 2020-11-02 21:38:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dc9213b992139f5a3ae371bc6101afc7 SHA-1: 9ba7143339bd6798a80afa00c79ea3a10991334f SHA-256: 3c1c1770f24a5cbf3f87b5f253ef77106f37bb57767fe2070cae10ce1bc505a8
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains a URL that appears to be part of this malicious infrastructure. This suggests the file is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/aws?keyword=news+for+adolescents In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f910b3eb9338.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/virifurijib_lavesovot_ruxirigokiluse_mizid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f94359c2c656.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/462b74aadd9bd89.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/1ac394fa7764.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/wesarur.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/mukixomot.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2083024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6357c13-8748-4ef7-9744-28d6513868d4/91626935292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3758ef3-8d6c-406e-a645-c458ff532e40/zulodisamegebovovemep.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/65172233280.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/fuwotofolefokemetemo.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/dissection_carotide.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/75185733672.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/46797967418.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_off000072ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 5076 bytes
SHA-256: 4bf0288e59bd3eeae123397d69b6264819e077438d38ccafcdfe8d2fa13ea157
font_01_sfnt_off00008456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 10144 bytes
SHA-256: 2f94761e549bd7228e1b0e4a4b93211a6bbbdd284866c66e1802bad82cf9e015

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