Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2940e9bd2c563b…

MALICIOUS

PDF

42.8 KB Created: 2020-10-26 13:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46da82e7389ca000ff91987933a41c1f SHA-1: 50adc4af04527566e7c75be19c2d6c116a99712a SHA-256: 1f2940e9bd2c563bd3c392fb129e2f3353f21d95fc5c6faf715e0deb75f775cb
154 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its function as a redirector and a link farm, directing users to multiple suspicious URLs hosted on weebly.com and other domains. The embedded content, though obfuscated, contains a URL that appears to be part of a SEO spam campaign, attempting to lure users with keywords like 'sirloin tip roast cooking instructions'. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/123?keyword=sirloin+tip+roast+cooking+instructions
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/gubejajo_zasazizisa.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/7494562.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fobesesajet.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/loxesosetifited.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/876c5956c859bc8.pdf
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5f9602e0d7647.pdf
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/469898.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/zadexusu.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/0a92c.pdf
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/januvepe.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8800d118ac4.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f89c32e24a9e.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f917979a4c51.pdf
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f93a9226b617.pdf
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5f94eee248eae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/dozuburadon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/tazavefejetusuporoxo.pdf
    • https://cdn.shopify.com/s/files/1/0503/1496/9261/files/woresojutapexufupak.pdf
    • https://cdn.shopify.com/s/files/1/0496/4397/8922/files/blueface_football_interview.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/9492519901.pdf
    • https://cdn.shopify.com/s/files/1/0465/1316/0350/files/nursing_diagnosis_risk_for_infection_related_to_surgical_incision.pdf
    • https://cdn.shopify.com/s/files/1/0430/5843/0106/files/microsoft_tfs_tutorial.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006929.bin
c198d318c57b799e95252be5e1eb4c3c80dd5009fbbd2d2d97bfb54afae6d8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 5268 bytes
font_01_sfnt_off00007b14.bin
31895e1bb62b7d9f01eda46e6fdb49725e482694739ad99926494036d9f7a32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 10120 bytes

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