Malicious PDF — malware analysis report

Static analysis result for SHA-256 0936fc55bccd647a…

MALICIOUS

PDF

45.8 KB Created: 2020-08-09 07:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53ec67714d9f9c8f84fe64775104b30 SHA-1: 90f433a9b02fcd524fd859e39433598dc96f208f SHA-256: 0936fc55bccd647a118447b63de96aaf8b632931e958bd6a72bbeb056a87f03e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host numerous PDF files. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness.

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=2020+beers+criteria+pdf
    • http://fetiwe.panama-yachting-services.com/uploads/1/3/2/7/132741555/napewo.pdf
    • http://files.paulsugarfoundation.com/uploads/1/3/0/8/130813645/namajebizaj_sapajotapa_nevipizixaku.pdf
    • http://files.ambermoorend.com/uploads/1/3/0/7/130776735/gumotuser_vusasosi.pdf
    • http://files.abbeytennis.com/uploads/1/3/0/9/130969710/2e54d.pdf
    • http://files.almeria-estates-and-realty.com/uploads/1/3/1/4/131437351/fefozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/vedic_astrology_books_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/desubevidutebon.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/14928229179.pdf
    • https://cdn.shopify.com/s/files/1/0447/3192/4629/files/hypothalamus_four_fs.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/sabuxek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/pemagojepa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/vejiga_urinaria_funcion.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/luzumam.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/wepij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/46289059408.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2213/files/12523401177.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/23540814090.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/tasigetofugagowiwurot.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_off00007361.bin
3a66e7b6427b3fd9548a966c41fd4650b87801dd33f5e5ec2f326c511e26d3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7361 5436 bytes
font_01_sfnt_off000085e0.bin
68df077090a8fdb1d569bfdd2183e18d2c7aa9eaf263cdea70b6ceca9da073a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E0 10676 bytes

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