Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a50f3f49dbf9c70…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 04:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c3fd3a876d7f70827f0a319698a993f SHA-1: 97594e83a0d84cc904047eaf0ee38c74487f754f SHA-256: 0a50f3f49dbf9c70c0bbee80769034325526f11911c3e0f8be02e42c639857de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and heuristics indicating it is malicious. It contains a significant number of embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs, suggesting an attempt to lure users to external sites. The presence of a large link farm points towards SEO manipulation or traffic generation tactics.

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.ru/pify?keyword=apastamba+grihya+sutra+pdf
    • http://files.jrsautospa.com/uploads/1/3/1/0/131070374/9e48128d696a548.pdf
    • http://files.styer-fitzgerald.net/uploads/1/3/1/1/131164364/922863.pdf
    • http://files.skyviewbands.com/uploads/1/3/0/8/130813612/rilavirepi_kamelasaxel.pdf
    • http://files.drwilliammunro.com.au/uploads/1/3/2/8/132815872/8150622.pdf
    • http://files.celebelle.com/uploads/1/3/1/1/131163774/luwesimo_mawateni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4831/9638/files/bayesian_data_analysis_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/rujijejajadot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/october_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/bibevafemidom.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/75983320438.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/bolshevism_from_moses_to_lenin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/rujanuvilazedivexanoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/2693/9042/files/65261348266.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/zodirajuluviwanazog.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1968/files/37529047354.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/47753801475.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/52339768650.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_off00006c6c.bin
edc7d515046fbc356cc942e8222b918f60639729917e6b99d46e685847f9867a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 5652 bytes
font_01_sfnt_off00007f7d.bin
66028dd856bc3c348f9a8665085e6f09f95e8db11294b3982c6c4eb39e92135e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 9868 bytes

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