Malicious PDF — malware analysis report

Static analysis result for SHA-256 6949fe42b070bba4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 21:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6457ebbacbd25d00251dd7d9727d6f81 SHA-1: 7e86784381ce840befe0694dd3fe23350b7b4704 SHA-256: 6949fe42b070bba45d619f6cce7ba294a37b28e86b18ce64710defb2bb5efbbe
174 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as a free car repair manual download. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm structure indicate an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=free+car+repair+manuals+pdf+download
    • http://buwete.solidrockglobal.org/uploads/1/3/0/8/130873995/bovunuferer.pdf
    • http://files.betheone.co/uploads/1/3/2/8/132814468/29a494fc1831a.pdf
    • http://xabowan.sicksticksgolf.com/uploads/1/3/0/7/130739072/a867ee75d18.pdf
    • http://sudasewog.ashequilters.org/uploads/1/3/1/8/131856257/ec0d0cd727c562d.pdf
    • http://sixok.ukulelebuyingguide.com/uploads/1/3/1/6/131637240/8843583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/vugamojupexinigawagev.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/40410611040.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/bimonebesixivixiluji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/gewifitezok.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/bubidaborikoxowazax.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/37853445201.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/sofojewedaneriv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/english_phonetics_and_phonology_a_practical_course_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/3401392667.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/78863922112.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_off00005d40.bin
07ef91c96153adbc7e061a0bfaf4a2a00b415e2b3e5269b3942bac74db02aa81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 5348 bytes
font_01_sfnt_off00006f66.bin
307dac8a577d0d5dc09de89e669b9a8315ea89baf0c9db2a5d0f46a17d78d3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10436 bytes

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