Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de25bed30e9d3d0…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 20:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ef6a18d99807bcf187b991d549f314 SHA-1: d7837b71de5b716fe9d7bc285b75acf88101ca0b SHA-256: 5de25bed30e9d3d0a2239e561550838700df9c1878dee3c51166d3718653cb46
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is `https://ttraff.com/pify?keyword=bilingualism+research+pdf`, which is likely used to redirect users to a phishing or malware distribution site. The document also contains a large number of other PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=bilingualism+research+pdf
    • http://files.mattblackhall.com/uploads/1/3/0/9/130969820/74696963fbb50c.pdf
    • http://files.bowriderboats.ca/uploads/1/3/1/4/131483097/49ca747c86923.pdf
    • http://files.katydunlapyoga.com/uploads/1/3/0/9/130968920/jigadexizadudaw_baniretepire_menedezerig_wejajoje.pdf
    • http://files.armaeroconsultants.com/uploads/1/3/1/6/131607467/1610181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3752/2082/files/equatorial_coordinate_system.pdf
    • https://cdn.shopify.com/s/files/1/0439/2232/5672/files/knee_pain_exercises_arthritis_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/vita_saw_tf2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/18635144530.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/31041577220.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/bomatevagemisalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/15236947358.pdf
    • https://cdn.shopify.com/s/files/1/0436/5379/1909/files/diner_dash_flo_on_the_go.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7618/files/53460327127.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0245/files/stomatitis_aftosa_rekuren.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/dijozerebofatusi.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_off00006c42.bin
2954146e9c75ece24378f3d25ffee4b953c6da769fb859bbfa77acef06b29978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C42 5312 bytes
font_01_sfnt_off00007e15.bin
85519639f51e8b3f0140b55848d732778832ba506c19a572a52ab7eef109b0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E15 10308 bytes
font_02_sfnt_off0000a171.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA171 4324 bytes

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