Malicious PDF — malware analysis report

Static analysis result for SHA-256 720b9f9a03429a3c…

MALICIOUS

PDF

53.9 KB Created: 2020-08-24 01:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394066269de4edb084c5317f40ffc2bd SHA-1: de5cd72664b0d6ee97c83d296689c05fa31b3d0c SHA-256: 720b9f9a03429a3cd126cf4672a4127608055fa1ee831a9669086f68ccca2bd3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely initiated via spearphishing.

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/pify?keyword=surmai+fish+nutritional+information
    • http://files.annehuthartist.com/uploads/1/3/2/7/132710634/nolerilegemu.pdf
    • http://files.newqueervisions.com/uploads/1/3/1/0/131070588/9366940.pdf
    • http://tubud.jaseelectrical.com/uploads/1/3/1/4/131407424/172f2101bcaf93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/jewof.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/caries_rampante_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/kovilexenaxapowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/94680545760.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/69098388242.pdf
    • https://cdn.shopify.com/s/files/1/0429/1615/1455/files/36016304161.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/add_fractions_with_unlike_denominators_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/reactions_of_aldehydes_and_ketones.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6264/files/bulletin_de_salaire_exemple.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/eight_days_a_week_chords.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_off00009327.bin
4080081866f350d534aa05a66158ab7dbf52396d54d1de333609daba8c83d45c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9327 5108 bytes
font_01_sfnt_off0000a45a.bin
78515a91c1298f5837ec7c0570b3ccb4d167d22c1437f2d440ba5bbcbb372a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA45A 11896 bytes