Malicious PDF — malware analysis report

Static analysis result for SHA-256 b909e7f3cbfb73dc…

MALICIOUS

PDF

41.3 KB Created: 2020-10-29 22:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5eb967c879b3bcc04a6ed1a564b63f89 SHA-1: b9970ecf2988e30ab643c65a0092ac09d3b9b3aa SHA-256: b909e7f3cbfb73dc78614e71dbe79170cfca89004dcc3c766d213e46b08080fd
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links, suggesting an attempt to direct users to potentially harmful content.

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://ttraff.club/123?keyword=beeman+air+rifle In PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/sujegelokebazu.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/6863904.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/zefiziwatukoxa.pdfIn PDF document text
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/8724316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8777b63b239.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/552a91b0867dd.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/wufinojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f95e0d225a06.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/3417563.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/32b760d2da65d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5f97c8f5b212b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f993e2670ae4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9472/7574/files/gilogalidekapu.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/1277644731.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7852/6132/files/naming_molecular_compounds_worksheet_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5674 4380 bytes
SHA-256: bb01129035a27c1526f0be0950113aa61c5d739e13d0912042b905562b32857c
font_01_sfnt_off0000651b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 11412 bytes
SHA-256: 2799d1ceeb9ff65e75b9144b291547b24f4c678bb606628b48288919016d6059
font_02_sfnt_off00008ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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