Malicious PDF — malware analysis report

Static analysis result for SHA-256 857482389afe15a2…

MALICIOUS

PDF

35.8 KB Created: 2020-08-02 09:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d32713388e49eeffbf962dbf5d5e0a2 SHA-1: 1dc38b377eea92b92d4950e07ce3f7f06669dd13 SHA-256: 857482389afe15a2693f16281217a4ede4591066c3c96bb3b1a9311b917f1297
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and references to 'Macys day parade chords', suggesting a lure. The ML classifier also strongly indicated maliciousness.

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=macys+day+parade+chords
    • http://files.jaydaitkaci.com/uploads/1/3/1/3/131384679/f569e91f2.pdf
    • http://files.rochefortconsulting.com/uploads/1/3/0/8/130873758/5380146.pdf
    • http://files.divorcecoachaustin.com/uploads/1/3/2/7/132740905/piwedoxigasusam_zukamuk_rixutipewagew.pdf
    • http://files.leitrimsocietyofny.com/uploads/1/3/0/7/130739993/d5ba04546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/xalegoboxomufebijewepari.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/revojidewukipemiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/kotogosuzupuzapatakukisim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/puluzebiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/noledogokeduworu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/dadodakiluga.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/wuvutafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/dorics_quest_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/sesejasojagimifok.pdf
    • https://cdn.shopify.com/s/files/1/0433/2791/4152/files/48024992227.pdf
    • https://cdn.shopify.com/s/files/1/0436/7322/3321/files/85353120607.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/22476220345.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_off00004d0b.bin
89cb9faea2fb50474645f9042db511d1dd95031e33ed10286e55cda1cf41f5e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0B 5236 bytes
font_01_sfnt_off00005ee6.bin
73a2d352c1009232e2192d8d5f544ba2870203b7ccfc3e8f17693f612c8b3ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE6 10344 bytes

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