Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac5f532fb8bbbe6…

MALICIOUS

PDF

45.5 KB Created: 2020-08-27 22:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c498b25c307229c9867f4fd22e6307 SHA-1: 6c64d698ce2a574d8b6c0835740ba6fffced3f62 SHA-256: 0ac5f532fb8bbbe6dd235fc6aa62db98a3ffb5059f9b93b9a0f3d3bfdae43405
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for free audiobooks. This suggests a phishing or scam attempt to drive traffic to malicious infrastructure. The PDF also contains a large number of links to other PDFs, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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.com/pify?keyword=city+of+fallen+angels+audiobook+mp3+free
    • http://regeminug.lawrenceparkschoolblog.com/uploads/1/3/2/7/132712336/13ce4d06.pdf
    • http://wifexuv.penickasmith.com/uploads/1/3/0/7/130738658/pejepol_jarozofapev.pdf
    • http://files.aliciavillegasart.com/uploads/1/3/0/8/130874633/jotijafasiwopu_wumomuvur_xejidaziwubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/1869/1239/files/grim_soul_guide_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/52921582020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/tukatujafumenaduwavuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/potaliw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/usa_weekly_studies.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/free_factory_auto_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/86887560175.pdf
    • https://cdn.shopify.com/s/files/1/0462/4249/6663/files/marajimiwafoxero.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/46321783743.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/32501652210.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/flight_pilot_simulator_3d_free_hack_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/alerion_clean_power_annual_report.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_off0000721e.bin
acd39f322a3bfb883849a8a3b2a72d7e87aff3e29fa5cd47f8f95eb703437bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721E 5736 bytes
font_01_sfnt_off0000859c.bin
b2bc83fcda4bfe79f53bf48d32e8984ea9f3483c05715f9617a53df146fc4372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 10420 bytes

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