Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ba63ef476ca763…

MALICIOUS

PDF

43.2 KB Created: 2020-08-08 12:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c2c1d338c37e553177418b27dd8fb3 SHA-1: 0ef5457bf16d667019e04b1d2f3500a009a5ea3a SHA-256: c8ba63ef476ca7630350530d7983ad8818d1d5af0e5d27c78237981fd3ae844e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a cricket score book, which is a common lure. The ML classifier strongly indicated maliciousness. The document body contains the malicious URL and numerous other URLs pointing to PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking 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.cc/pify?keyword=cricket+score+book+pdf+format
    • http://files.sandiegoiaido.com/uploads/1/3/0/8/130813765/3131509.pdf
    • http://files.tcars.info/uploads/1/3/2/6/132681556/8526250.pdf
    • http://bujumiza.gaustinpaintings.com/uploads/1/3/2/7/132710797/4cecee378a325d3.pdf
    • https://cdn.shopify.com/s/files/1/0438/8516/6760/files/55766734487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/problems_on_time_value_of_money.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/64559101732.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/78441305532.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/19909310211.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/fenifamuxotewavedeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/wagufivi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/back_to_school_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/52709239111.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/lightning_hammer_nuclear_throne.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/anatomy_and_physiology_nervous_system_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/16675441713.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_off00005ec3.bin
fac563daabfd57daea83bf6d13bafb9d4641b794f127edf6c89d752b00e52dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 5176 bytes
font_01_sfnt_off00007055.bin
9345f48af34c47dbd4d0c71f4a0a45a09902da9c4da59e0b0ee95e4242b6dcd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7055 9776 bytes
font_02_sfnt_off000091b8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B8 4324 bytes

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