Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb18806cc87f67d…

MALICIOUS

PDF

37.4 KB Created: 2020-09-10 02:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14b6492a05a61d59ca53ab6bfafbdbda SHA-1: 17da2e1637a75b34cb201f4a25090dba28c5e52c SHA-256: cfb18806cc87f67d4eae51e128e196aad6241f477b5995a26ab92f7334ba4a4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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.ru/wix?keyword=nepali+general+knowledge+questions+answers+pdf In PDF document text
    • http://livabobu.multinationalmemphis.org/uploads/1/3/1/6/131636698/jejadowigamufetuve.pdfIn PDF document text
    • http://files.soundsofmars.com/uploads/1/3/1/0/131070336/fenegitokumeruxola.pdfIn PDF document text
    • http://muvip.kanoklin.com/uploads/1/3/1/4/131407178/fd39e7641efb4.pdfIn PDF document text
    • http://files.bahamasteachercadets.com/uploads/1/3/2/8/132814097/wotawudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static.usrfiles.com/ugd/3c2969_aeb14eaaccd94b07850abc5cb6a6dd13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/xokase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3230/5813/files/77480175342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/varanomavumozomadeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4023/3880/files/aws_developer_certification_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/libro_gordis_epidemiologia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/1230/1479/files/1468111809.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_off0000455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x455A 5460 bytes
SHA-256: 2afa6dd136931e3d5596821ac8c9fd80a14ce7e2cc75a2610c525b812c02e734
font_01_sfnt_off0000580d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x580D 9892 bytes
SHA-256: b594192433634915364a66b10770968b21482bf730dacb64efbacca600915179
font_02_sfnt_off000079da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DA 3108 bytes
SHA-256: 08f9b091e3a0a97940f28bcfe8e46798381de32e27fe0155ac5865d919a4b561

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