Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6fbed7d7f25535…

MALICIOUS

PDF

46.0 KB Created: 2020-09-17 18:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07dc7dba98fc4acc7c6eba5f951f92bb SHA-1: dbff384cb2ce5a52e9a8be00854b944e562705be SHA-256: 3f6fbed7d7f25535f3394f6571e379d73906408c6f3392337aab0c667729a5ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.link, which is disguised as a study guide. The document body and embedded URLs reinforce this lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malicious content.

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.link/wix?keyword=math+30-2+study+guide
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/65770081178.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/traductor_portugues_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6757/files/espn_sports_sideline_reporters.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/5976381548.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/xabowudoxone.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/can_can_t_with_adverbs_of_manner_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/6264852685.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/jutizulawojajigesipatewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/quien_fue_gonzalo_guerrero.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/bixadewaligumidezowagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/unidades_de_aprendizaje_autonomo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c8.bin
c86649a479b90505b8d56a9ba17ba3cc5147d8d50e98aafac542719c32fbcd6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C8 5536 bytes
font_01_sfnt_off00007cbb.bin
ef7f3b075b60379e7385d5f7bfc51ecc2e933b6e4ee4c592d584a5365c97056c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBB 15484 bytes

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