Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99016d73eadbdb0…

MALICIOUS

PDF

45.6 KB Created: 2020-10-28 11:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: de8e7cb4e047e426de5bf1efe17613e6 SHA-1: 481641269e8272888c6f8df6a386192faeaf6ac6 SHA-256: b99016d73eadbdb0b9862abee4fa3f8c4a0665ce522dea635ece914b5c7845f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://gettraff.ru/pify?keyword=lc+bird+hs'. It also exhibits characteristics of a PDF link farm, with numerous external PDF links, including 'https://s3.amazonaws.com/subud/64399615617.pdf'. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

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://gettraff.ru/pify?keyword=lc+bird+hs In 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/64399615617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/40027394732.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/virotuxunesarilala.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/punabuwizutivijiregevigov.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/32250340106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eabd8a1-af9b-4975-b0b7-b1f1ec009062/percy_jackson_the_son_of_neptune_fanfiction.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/capricorn_and_cancer_sex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/45988087445.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/balenib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14948261-a5f0-4d81-b361-71675551be37/xasurivomukuwazogixix.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/mazuluxura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8753/5522/files/formato_5_sedena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6466/7541/files/vaxoziriris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739ef36e-0f2c-4442-8929-a1842ee67c85/61648148706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06cb12b-b65d-4fee-8cd6-ea9273b5eeac/84120062118.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/construction_safety_signs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4875ab-4997-46bf-a480-7d19109cf3fc/jazanubotivodugipupe.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_off0000734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 4868 bytes
SHA-256: 4dc18a6f65381b3a1e253825642fda245dd5b875c10305640334f533d29a618a
font_01_sfnt_off000083d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 11380 bytes
SHA-256: 1950bf684c3f1177b3ea6df19184653ca4eef54b6646491cd28cfa2d85bdef52

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