Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa59d3a3aacfe150…

MALICIOUS

PDF

46.7 KB Created: 2020-08-25 07:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1de9cec89954c59c353b89af7e38be SHA-1: e2916958113f7ab8a8a7079151ed147057a3b088 SHA-256: fa59d3a3aacfe1505525aaf1478344e2ca3bf07511ec9d39ec903e48cbdca448
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=fisherman%2527+s+friends+imdb+parents+guide. This indicates the document's primary purpose is to redirect users to potentially harmful sites. Additionally, the PDF was flagged by an ML classifier as malicious and contains a large number of external links, suggesting a link farm or distribution mechanism. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence for the attack pattern.

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=fisherman%2527+s+friends+imdb+parents+guide
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdf
    • http://tuxavipu.chaiscope.org/uploads/1/3/0/8/130814172/3956519.pdf
    • http://dupovo.spikemclarrity.com/uploads/1/3/0/7/130738948/muxujerimimenoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/inflectional_morphology_and_derivational_morphology.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/lowest_common_ancestor.pdf
    • https://cdn.shopify.com/s/files/1/0437/0910/4279/files/periodic_table_coloring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/70905038635.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/70453651822.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/rifavuxivolodako.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6049/files/tamavuvivawapel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/camozzi_pneumatic_cylinder_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/best_free_reader_for_ipad_mini.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/58504367050.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/niragedupuserivibi.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_off00006a90.bin
994d54768b509ff12d348eeefe735470d0053a3c34df6deecf88970ee49b2f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 5324 bytes
font_01_sfnt_off00007c76.bin
9f5c3ed597bd3dc4d56ccc6b6e821d4a1b5e81177432b04c9a8a3574e27add1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C76 10260 bytes
font_02_sfnt_off00009fab.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAB 4324 bytes

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