Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a097dcbc7c886b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-23 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c50532cdfbfddbbc7241e7c90c80945 SHA-1: 3b013890c04aa9d556d6aba51f7c84a867db9b2b SHA-256: 72a097dcbc7c886b598c5275f53f52cff10687b855220142d5a3bbb3a8c78819
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'video maker android' and a URL that is likely part of a link farm designed to attract search engine traffic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious sites via embedded links.

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.cc/pify?keyword=video+maker+android+2.+3.+6
    • http://files.crowlitmag.com/uploads/1/3/0/7/130775462/a15c0d911cfc61.pdf
    • http://files.10xstocks.com/uploads/1/3/0/7/130775050/damesanuvitugu_firav_gawuvo.pdf
    • http://pozusixil.wingrabrittanys.com/uploads/1/3/1/0/131070161/2352110.pdf
    • http://files.sigmazetacouncilsc.org/uploads/1/3/1/3/131383384/06071370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/pofowu.pdf
    • https://cdn.shopify.com/s/files/1/0463/3211/7147/files/bhola_baba_video_song_hd.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/20255469203.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9079/files/intel_crystal_well.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16779745642.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/tales_of_symphonia_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/1038821431.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/neoclassical_economics_assumptions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/71796421942.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/kedekudoxerelavuvodinav.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_off00006823.bin
eabccf000a6e806c44ad7c260922100dd9f0828184d571c219838c8995cc4168
pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5272 bytes
font_01_sfnt_off000079ff.bin
09e7a2ea49c3b30956cbbe4020c078c28a127311594aeaf71ed16c03e95871ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 10244 bytes