Malicious PDF — malware analysis report

Static analysis result for SHA-256 12446b410a298503…

MALICIOUS

PDF

35.5 KB Created: 2020-08-09 03:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a4aaea5350222e3429519e2252c5d5 SHA-1: 7f0a19ed0d40f666d023283a07fe7c145073993e SHA-256: 12446b410a298503730c3215dc8b8e36e0fd6365a083387524ee9556a34ef097
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various external PDFs, including one pointing to a known malicious redirector. The document body and embedded links suggest a social engineering attempt to trick users into navigating to potentially harmful content. 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=les+v%25C3%25AAtements+en+allemand+pdf
    • http://files.australianbowhuntingmedia.com.au/uploads/1/3/1/0/131070912/b74a1d25.pdf
    • http://files.parentingroundaboutpodcast.com/uploads/1/3/1/4/131453592/lawizop_fusajaligawefox.pdf
    • http://files.onbradstreetfarm.com/uploads/1/3/1/6/131606035/8708495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/ruvuzezexubavemetubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2678/files/jorofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/sebofokipuzudibilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/agreement_on_rules_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0454/4541/5070/files/les_types_des_cameras_de_surveillance.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/wutiboxobirigazagu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/26249753904.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0433/9102/5306/files/70432778971.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.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_off00004744.bin
765dc428c2808fc21cf29801990666636e3979cf323b4ace1d8c2ad42d90f8b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4744 5240 bytes
font_01_sfnt_off000058d1.bin
fa3fe72bf82ee8de60b4d430f7ee7695f39fe3126f43b6bca2dc9e97564e9c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 12088 bytes