Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43952fdb42e2a57…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 10:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 049305008b4c3bbd44c2edfe5342cdc8 SHA-1: 05f53d3d0812d4cad36df79f36b79bb427dd9490 SHA-256: a43952fdb42e2a57c1b902c339a8bf4033d100a9ae94af12ef46424d53b417e3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=ejercicios+para+distinguir+adjetivos, points to a known malicious redirector. The document body is heavily obfuscated but appears to contain the same URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=ejercicios+para+distinguir+adjetivos
    • https://static.usrfiles.com/ugd/b8c837_36b94304d93f40bca7dbe41b437efeb7.pdf
    • https://static.usrfiles.com/ugd/affb4a_70aa3448dfb74841a67af05bbc7e65c7.pdf
    • https://static.usrfiles.com/ugd/238140_366d9b3f93bf48389847c8e55898dbe1.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/wilosumomegigelipedogako.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/81305683030.pdf
    • https://cdn.shopify.com/s/files/1/0433/3348/4699/files/ncert_maths_book_class_8_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/22856296712.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/agrgation_definition_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/ncis_new_orleans_episode_guide_season_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/rezofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2977/files/formule_pour_calculer_le_poids_ideal.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/list_of_automobile_engineering_colleges_in_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/alevines_tilapia_roja.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5565/files/zesojofofubajeserasegu.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_off00006237.bin
c9b943a8c73450977166c47123cd943ee9de463bb14ff817dc53532c7a5101c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5300 bytes
font_01_sfnt_off0000745a.bin
c5d854c156b9a07853c4417b913212600d4de508451875b3d7f237e39474d4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 11744 bytes

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