Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f913f7f0d5df3a9…

MALICIOUS

PDF

54.8 KB Created: 2020-08-26 20:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc96a1d05d20847dbbfa98dbcc8c649d SHA-1: 3ea00847dcaab23ee544016763889b6ab3235ea3 SHA-256: 5f913f7f0d5df3a9bbd98a7964cae713b4e5bfc38feb720ae9bd35e5365ed72c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=gander+mountain+dehydrator'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of 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/pify?keyword=gander+mountain+dehydrator
    • http://files.strongbow.info/uploads/1/3/1/6/131606968/volurenifima.pdf
    • http://files.d365promotions.com/uploads/1/3/0/8/130813988/169765.pdf
    • http://files.maruf.eu/uploads/1/3/0/8/130813526/4085458.pdf
    • http://files.malcolmcounseling.com/uploads/1/3/1/6/131606603/5215416.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0463/3634/4226/files/jakebojixamobubekara.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/rajefipivopi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/aprender_a_leer_y_escribir_coreano.pdf
    • https://cdn.shopify.com/s/files/1/0462/6992/3477/files/npav_antivirus_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0446/7671/0563/files/lacrosse_certificate_templates.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/554589668.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/border_design_for_a4_size_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/50523151160.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/zokedaguwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/wugomebotosinorulalunuzob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7203/files/75288903949.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/vugeda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c5d.bin
b950483a80ed99dd05ca8c64b22b5cedc164f3b2a2d99015740a536b7dd1b56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5D 4868 bytes
font_01_sfnt_off00009cbc.bin
e6b50f42894e5b0017c6bf08b10af4584784b860d32ea6f3890c448870821b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBC 10204 bytes
font_02_sfnt_off0000bfab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 4324 bytes

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