Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b611e74cae160ec…

MALICIOUS

PDF

38.4 KB Created: 2020-08-25 11:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d8b8281d1ac89483c8e53276973265 SHA-1: 3e3fbbd4b7eb63da355d45bded807f1e2ea3d858 SHA-256: 3b611e74cae160eca89d58b74a3aa297186b2acc3ce56cc0ee975f8e0ff2553d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector service (ttraff.com) which is flagged as malicious. The document body, though obfuscated, contains the same text as the URL's keyword parameter, suggesting a lure related to a '2016 buick enclave owner's manual'. The PDF also hosts a large number of links to other PDFs, many of which are hosted on unknown domains, indicating a potential link farm or distribution network for malicious content.

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.com/pify?keyword=2016+buick+enclave+owner%2527+s+manual
    • http://kanofuf.uniontownartclub.org/uploads/1/3/0/7/130739974/c38b0dcec15636.pdf
    • http://files.shopglowonline.com/uploads/1/3/1/3/131384718/nipavebofonodab.pdf
    • http://files.woodlandparkpack20.org/uploads/1/3/1/3/131383358/5522124.pdf
    • http://zajezub.merakimood.com/uploads/1/3/0/8/130874001/jilak.pdf
    • http://files.glenoakscommunity.org/uploads/1/3/0/8/130874691/xavujoniwam-pikofafidefepip.pdf
    • https://cdn.shopify.com/s/files/1/0440/1856/5278/files/3d_wallpaper_for_android_butterfly.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/89489443931.pdf
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/read_inheritance_book_4_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/4350/3518/files/landlord_rental_inspection_checklist_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/33239140642.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/cooking_merit_badge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/9653/7243/files/chalkboard_writing_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/pivimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3390/2760/files/17401047047.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/xaruvuwak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/33263650965.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6589/files/192711580.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_off000057ce.bin
19665ced8a198e35d34f2e995058a61fb136e8e5564f261026723968b5648673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CE 5720 bytes
font_01_sfnt_off00006b3d.bin
80ce57d6851e9c0d78d7efdf899772f92eca842170d158d6b03dcd3a42b133d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 9796 bytes

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