Malicious PDF — malware analysis report

Static analysis result for SHA-256 74625f0a88589418…

MALICIOUS

PDF

53.3 KB Created: 2020-08-13 20:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b5812d5fce5696317d7cdd330431c49 SHA-1: 61a775cb3c714b3ba3ebef20763858f04b93d19d SHA-256: 74625f0a88589418e44a87d0e0ead67fee4f8c0f13f884ea6f50e17f3a6a8411
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wb?keyword=westinghouse%20ceiling%20fan%20user%20manual, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure under the guise of providing a user manual. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly 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.cc/wb?keyword=westinghouse%20ceiling%20fan%20user%20manual
    • http://files.annalisacrawford.com/uploads/1/3/1/3/131379699/dedec0.pdf
    • http://files.joeyspancake.com/uploads/1/3/1/3/131379946/3a309b06dbb0b2d.pdf
    • http://files.thrilltheworldaustraliamelb.com/uploads/1/3/1/8/131856276/xakowajuluxutomeve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/fujotiduvajupogikewerani.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/puwilasovejununibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9321/3855/files/foxosatuwonanazilu.pdf
    • https://cdn.shopify.com/s/files/1/0452/2462/4288/files/protect_adobe_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdf
    • http://files.stdunstans.bham.sch.uk/uploads/1/3/0/9/130968996/839451.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/55843396134.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/49730341879.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4893/files/jvc_everio_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/47965569203.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/29003511799.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/bakifawugijuxenajeropa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/nopiravapezor.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/potumofe.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_off00008d8b.bin
4114d37fba92f6fb71e3ff940b9c45c6f0fac2709c2c7835b69d18df58c544f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8B 5308 bytes
font_01_sfnt_off00009f7e.bin
80fe66eee5aae0a093a5bd36473348e3ff9d5e8c58e9fa0102ff8198997bea06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7E 12612 bytes

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