Malicious PDF — malware analysis report

Static analysis result for SHA-256 090c4509a94caaac…

MALICIOUS

PDF

49.9 KB Created: 2020-08-20 06:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54fbd94adb3a5dcca93f7eba9060f209 SHA-1: 909e9c43edcabfa5cf17d860143c4f6fe6a898cb SHA-256: 090c4509a94caaace2099c06b2820ac79f3e8d0d0350d1bbda2f1acf8a44cdf9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=pokemon+heart+gold+kanto+guide+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector.

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=pokemon+heart+gold+kanto+guide+pdf
    • http://dukewajo.shannonsstudio.com/uploads/1/3/2/6/132683292/9128695.pdf
    • http://jibun.keepingclean.services/uploads/1/3/1/4/131483281/38f93ebd2f.pdf
    • http://files.caiweiyi.com/uploads/1/3/0/9/130969681/gusibopimoxixo-sidaruj-kaledivimi.pdf
    • http://vuwudil.gallowaynyc.org/uploads/1/3/1/3/131383483/56f7ac768704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/angina_de_vincent_y_ludwig.pdf
    • https://cdn.shopify.com/s/files/1/0447/0997/0073/files/feudalism_2_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/58930833701.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7949/files/bepivuwekapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/bluestacks_for_2gb_ram_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/kejimikekedepixuregur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/6419013660.pdf
    • https://cdn.shopify.com/s/files/1/0439/1088/9624/files/42271463746.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/47506167506.pdf
    • https://cdn.shopify.com/s/files/1/0435/5420/9943/files/toxabipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9829/files/64450546971.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cbc.bin
44a4c9b17349bd1dcfa507d41a76fb215a2526d26c4502a3f62d4f649281c6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBC 5344 bytes
font_01_sfnt_off00007eb6.bin
574c3fb1d58bcd95982854e9309e4e91f6c5c75326a8a6b7716c089d84d01323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB6 10656 bytes
font_02_sfnt_off0000a331.bin
19b617b67b1bfb71b1b2129089084724088fda050aecd04fe64e6cfb54779f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA331 16628 bytes

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