Malicious PDF — malware analysis report

Static analysis result for SHA-256 102bfc1d7c08d6ff…

MALICIOUS

PDF

46.4 KB Created: 2020-08-18 15:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3808f7b805e365e4d842fe05e3662f SHA-1: 61900769b11849b9e53d0283a7fdbab7b4d9c5ca SHA-256: 102bfc1d7c08d6ff862ecdc49e31df81b36a46f259d63fc44f9ac4a3620fb3b8
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 external PDF files, suggesting a link farm or redirection scheme. One prominent URL, 'https://ttraff.ru/pify?keyword=my+job+history+report', is flagged as malicious. The document body text, though partially corrupted, includes the phrase 'My job history report', aligning with the malicious URL's keyword. 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.ru/pify?keyword=my+job+history+report
    • http://files.unionheightselementary-carthagetn.com/uploads/1/3/1/4/131409135/raxamowonuxem_munimo_buzofirel.pdf
    • http://files.ejacts.com/uploads/1/3/1/3/131384018/givebivusunilujogoj.pdf
    • http://gafevufu.meghanfialkoff.net/uploads/1/3/0/7/130738697/be1c3bd3cf1541e.pdf
    • http://nematupu.josefinapain.com/uploads/1/3/1/3/131379290/1066860.pdf
    • http://tegile.acomputerconsultant.com/uploads/1/3/1/8/131858156/c970ab1c67c9def.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/dukufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5442/files/vobusuvutonelefo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4073/9226/files/bepaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/68607176356.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/61869518170.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/anfibios_anuros.pdf
    • https://cdn.shopify.com/s/files/1/0440/4854/8005/files/brooklyn_nine_nine_season_4_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/masuxijiluvexabizusiwude.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/59634093206.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/rejeralekituk.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_off00006c4c.bin
3972910a2751086cd52be05b1aa421921860895020f314ac9f80aed6951946d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 4672 bytes
font_01_sfnt_off00007c46.bin
71a73aa50ce7827735f3fc86b044b69b7f09eac5116771262b7454c8e04df529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 10180 bytes
font_02_sfnt_off00009f14.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F14 4324 bytes

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