Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df857c6b0a21e1a…

MALICIOUS

PDF

54.2 KB Created: 2020-07-29 00:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0d2977830acb23cd6cd4679d5f6e68 SHA-1: 8d5b38c8648dd3fdf280b025e0e14310a1a93ccb SHA-256: 5df857c6b0a21e1aee956cb7852e70ccaa9d51c4323b938b0b6615499201e9fb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'cyanide poisoning guidelines'. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to drive traffic to potentially harmful sites.

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.ru/pify?keyword=cyanide+poisoning+guidelines
    • http://files.monkeyhouselovesme.com/uploads/1/3/1/4/131438128/3269225.pdf
    • http://files.gestrainc.com/uploads/1/3/1/1/131163540/vobomow_povolofup_nebotugemo.pdf
    • http://files.hibiscusstitch.com/uploads/1/3/0/8/130813859/88ae3b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/16711778765.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/zalifavibubuzogajikax.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/79581062411.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/67960842511.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/maxumavamijiwinixasep.pdf
    • https://cdn.shopify.com/s/files/1/0440/9052/3813/files/mejapupokijepadulorogep.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/16548738487.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/26941550995.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/texazasevijibenulegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/28068001597.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/34603115190.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/jaxegozarerakepovasitiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/jovowabilekufefavizekut.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/bivarunesutuvelokesilux.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_off00009786.bin
e9d7f91e0dc3b9b623d46d1f99f0e65661019ab655d5ecb3931372e3a3ad13b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9786 4956 bytes
font_01_sfnt_off0000a872.bin
87bff3500ff381a88fac1a84f3621fde148a866919a9a2f19be4d0efc69221d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA872 10388 bytes

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