Malicious PDF — malware analysis report

Static analysis result for SHA-256 100381c2ed7366ee…

MALICIOUS

PDF

35.2 KB Created: 2020-08-22 07:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14723d9c47f032cbf9cf78cd2d5847bc SHA-1: 0b0b9fe75fdc8ff9a57631a41fe3f957d1a26ed6 SHA-256: 100381c2ed7366ee3c59121f90e3f60651bf6ff8ba6d2999e4ef1bc45ca7381e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=formation+of+tetrasporic+embryo+sac'. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution.

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=formation+of+tetrasporic+embryo+sac
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdf
    • http://nuzimanef.artisanbuildersconstruction.com/uploads/1/3/2/6/132682790/9464f3f.pdf
    • http://files.wodintl.org/uploads/1/3/1/6/131637482/nebajevasigudasop.pdf
    • http://files.socialhousedesigns.com/uploads/1/3/1/4/131453498/wamuwamul_remofove_takipenexawuw_wiwosaxiruja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/antenna_engineering_handbook_jasik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/vatamemavobosunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0465/0359/2094/files/gographie_politique_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3871/9648/files/xokabekakipesaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/65736792289.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.pdf
    • https://cdn.shopify.com/s/files/1/0431/6099/3943/files/dabuvipodekufaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9197/files/the_art_of_boudoir_photography.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9994/files/22700385312.pdf
    • https://cdn.shopify.com/s/files/1/0435/9572/7007/files/3134673148.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_off00004aa0.bin
54e0ad3e50ae55a9c11a2b5f2ac8eaab4af12faac70cda8e7fa91c5240aa824d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA0 5324 bytes
font_01_sfnt_off00005ca9.bin
e08210df791b8c63032a365698d0a9d9f705eedbcc3898f59dc49e959980847b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 10396 bytes

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