Malicious PDF — malware analysis report

Static analysis result for SHA-256 88217651fc88128b…

MALICIOUS

PDF

67.4 KB Created: 2020-07-08 17:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: c6c3bfda39b7795418601ce724179dc3 SHA-1: f8d813166ed201895328790813b629a24dd67531 SHA-256: 88217651fc88128bc4e17d54838d5f9cc2a3ee9565df739156ce0a8a2575ba87
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDF files hosted on numerous disposable domains. One of the embedded links directs to a known malicious redirector. This indicates a likely SEO manipulation or content distribution scheme, potentially used to host malicious payloads or phish for information.

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.cc/wb?keyword=ehrlich%20ascites%20carcinoma%20pdf In PDF document text
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdfIn PDF document text
    • http://files.redeemwithgod.org/uploads/1/3/1/0/131070911/jomolagofon_bufalemo_jaber_nujukimalijoz.pdfIn PDF document text
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdfIn PDF document text
    • http://files.laviishluxxe.com/uploads/1/3/0/7/130775942/1a41a3f.pdfIn PDF document text
    • http://files.edgesanddreams.com/uploads/1/3/0/8/130874458/4702ae253f06691.pdfIn PDF document text
    • http://files.ljohnsonlab.com/uploads/1/3/1/3/131381677/2219677.pdfIn PDF document text
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdfIn PDF document text
    • http://files.usydfoodcoop.org/uploads/1/3/1/3/131398246/a371099d3.pdfIn PDF document text
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdfIn PDF document text
    • http://files.hlfmgoats.com/uploads/1/3/1/3/131383553/jopaxubesoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kadipelo.files.wordpress.com/2020/06/tusaradedubuxijubupetin.pdfIn PDF document text
    • https://sojiralalili.files.wordpress.com/2020/07/58909360113.pdfIn PDF document text
    • https://sejidinaduk.files.wordpress.com/2020/06/vepavifijojepob.pdfIn PDF document text
    • https://fibizetu452198143.files.wordpress.com/2020/07/xaforabolederiragebaleb.pdfIn PDF document text
    • https://warezofokel.files.wordpress.com/2020/07/51753832785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC194 5140 bytes
SHA-256: 5d2ca9eb64ca983d2700a1cec6366b3b768a94be9bebee864ffc369a4c93c2af
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 14492 bytes
SHA-256: 7d95d4051427a2127f2171e06be258d0ef189c8fd1ff8d7875bb900d82d8a537

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