Malicious PDF — malware analysis report

Static analysis result for SHA-256 2838fbf998b3967a…

MALICIOUS

PDF

51.7 KB Created: 2020-08-11 21:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd38a3ab64dcd07461275fb00d23e721 SHA-1: e034db39c6050750746053a0279f636fda0a3429 SHA-256: 2838fbf998b3967ac8f69f34c8bc8cb8467cde31e41fdf3b0f8485a6fc2f8095
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=artritis+reumatoide+idiopatica+juvenil+pdf`. This indicates the document's primary purpose is to redirect users to malicious sites. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a social engineering lure.

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=artritis+reumatoide+idiopatica+juvenil+pdf
    • http://buponamax.aberdeennaturalburials.co.uk/uploads/1/3/2/6/132681947/7d7cdfcc5a.pdf
    • http://files.royalchange.fit/uploads/1/3/1/3/131383586/tovowazekanud.pdf
    • http://files.proactivepartnersllc.com/uploads/1/3/1/4/131407492/3264311.pdf
    • http://files.confidentskier.com/uploads/1/3/0/7/130740517/sururov-dodeforoxixem.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/zulifibatidejegukan.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9288/files/amharic_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/39548122698.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/wisope.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/semi_detailed_lesson_plan_in_english_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/96509181728.pdf
    • https://cdn.shopify.com/s/files/1/0428/5304/0295/files/gastrointestinal_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/dadiratavezemawatipobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/kigadifafejokibivuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/43379996480.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/cheat_codes_for_gta_san_andreas_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/7962/1026/files/29269397683.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000732d.bin
8b5ee0b76d8ced8ca79cc957650035eb17e6bc2ffc8a0cb81f02427f093cffc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 5308 bytes
font_01_sfnt_off0000852e.bin
85d7bf86d0d9ea1070c1afdcd0d271fe6617cc5327a10e4d0cc7851e46a85c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852E 15020 bytes
font_02_sfnt_off0000b365.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 4324 bytes

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