Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1f51a65a7e6318…

MALICIOUS

PDF

53.4 KB Created: 2020-08-11 06:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd24f2b3df3dcfb01e48be616865f41 SHA-1: cc75c52951ff2917ad4dfcec93fd5be69587bc4f SHA-256: 0a1f51a65a7e63189c266eac72425fde835b875d464d697e51e975b3c076ea32
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=auntie+mame+book+pdf', suggesting a lure to download or view content. The presence of numerous PDF links and a malicious redirector indicates a link farm or phishing attempt.

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=auntie+mame+book+pdf
    • http://daseri.twhawc.com/uploads/1/3/1/6/131636725/9004427.pdf
    • http://jadapas.altonmillpondhockey.ca/uploads/1/3/2/6/132682883/vudafuj.pdf
    • http://pedap.newreligioncurriculum.com/uploads/1/3/1/4/131482995/zabisesakoxolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/viwexuzitivigov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/53244247917.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/jeriz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/ratixaxobesawagos.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/sufujigazifavunijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/binuginopaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/isomerism_in_coordination_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/menesaxuju.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/50112697066.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/english_assessment_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/brgschaft_fr_miete.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/alimentos_con_carbohidratos_simples_y_complejos.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/adobe_after_effects_cs4_tutorials_for_beginners.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_off0000930d.bin
762c03dd7b8b5eb4035ba488d426a0b0506325e0f2771f8b8348b688f752bc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930D 5072 bytes
font_01_sfnt_off0000a43a.bin
ae25658fdb8e090d476b8de8790488eaf9c697a99ff7718ffc185b2344dacbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA43A 10936 bytes

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