Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c33fe0fd9cfab94…

MALICIOUS

PDF

50.8 KB Created: 2020-09-01 05:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9136b17d0f587a6205b0b2221b8cad2 SHA-1: a511c5830f956f5b7006075f9869e22dacadc486 SHA-256: 0c33fe0fd9cfab94a859ffde1f4ff666e9264ebe861e124f7314749705fc0693
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a 'household budget template'. The PDF_SEO_LINK_FARM heuristic indicates the PDF contains numerous external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=household+budget+template+canada
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1e32c2_a83d2f824e5e48d1a09601b3f0fb64f7.pdf
    • https://static.usrfiles.com/ugd/de60da_6855592e984e40e5a92cd2253b93c253.pdf
    • https://static.usrfiles.com/ugd/32acb1_a0eaf5e1728d4229b4cc5f0e62125221.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9208/files/nate_robinson_contract.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/speed_air_compresser.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/safekalodupewolixuloximi.pdf
    • https://static.usrfiles.com/ugd/a58b01_54002f3fd0d64b888a180de0acea8328.pdf
    • https://static.usrfiles.com/ugd/bb13a2_3b7cb8f01a5f4afd929ad7f79f514089.pdf
    • https://static.usrfiles.com/ugd/238140_5520b3ac84884495b64f61e126e0709e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c0101b12be4433f90a782b02d807459.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec80e12df15e4f289b8c212a7c91ffeb.pdf
    • https://static.usrfiles.com/ugd/0789d5_a682fa325ace46e597a87538817ff5e5.pdf
    • https://static.usrfiles.com/ugd/d4579c_3f9b1aa900c6487886dc6a59c198deb3.pdf
    • https://static.usrfiles.com/ugd/8acad3_3c8335ee1e3944c1ab91a84fae526175.pdf
    • https://static.usrfiles.com/ugd/a771bd_619237ad8e314ca38bef478d200a630c.pdf
    • https://static.usrfiles.com/ugd/2f7815_77f93f65b1d8455b8ae4cf4246e5f9bf.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_off00007dc1.bin
e60c07d6c723a69b21fad64df1d7e46d4fdc7f61310745bd589291829f7945ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC1 5492 bytes
font_01_sfnt_off0000903a.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903A 1800 bytes
font_02_sfnt_off000098c8.bin
decf57285b2ce9a921829e0280f3040b1313bc8afe3e05afa3c3276dda84885b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C8 10772 bytes

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