Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cabc7de5eeb32cf…

MALICIOUS

PDF

49.1 KB Created: 2020-08-07 07:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f27e3de2ef3a849c1e295817567bead SHA-1: abc732f58d8d707b2e1bc2c504c09acefcc550b5 SHA-256: 6cabc7de5eeb32cfb904f3f21a0513d7c85850397232cfe1b6a2a92838c97020
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=physics+textbook+year+11+pdf`. This URL is presented within the document body, disguised as a link to a physics textbook. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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=physics+textbook+year+11+pdf
    • http://files.longshort.ca/uploads/1/3/1/3/131381605/9637927.pdf
    • http://gubife.healingnl.com/uploads/1/3/0/8/130874232/c5a8d1.pdf
    • http://files.withoutbordersshop.com/uploads/1/3/2/7/132710575/d9be58fe2f658b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/18320135198.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/79915271246.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/20091836932.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/wulenutovatipadun.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/82474349983.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/93448217023.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/tuwusanubifofakatag.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3415/files/32293727374.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/xakimemibefalidubeboki.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/wibejadudag.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/fesikuvuripe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a3.bin
4be3ccb11c9cad3fe12d8c974e9e2e821b3971a5e8bf5f206101b898d834c885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 5320 bytes
font_01_sfnt_off000085c9.bin
1fc3c00bca23dae5888ae68ebf970b69b52ceb8e2480363ad1e202e92c43013c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 10356 bytes
font_02_sfnt_off0000a92c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA92C 4324 bytes

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