Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b5d70e349f631…

MALICIOUS

PDF

56.1 KB Created: 2020-08-05 15:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369dcae360649c1a71d50c7aa67b2491 SHA-1: ea8ee4ee8047ca0cea99c765ae3df2aa3daa4ce7 SHA-256: 984b5d70e349f6319d6b97754887ce0ef2d9b91cb0e79f90931329eb2e3fe195
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to shopify.com domains, but one critical link directs to a known malicious redirector at 'https://ttraff.cc/pify?keyword=books+of+the+bible+pdf+files'. This suggests a link farm or SEO poisoning tactic designed to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=books+of+the+bible+pdf+files
    • http://files.jeremywjohnston.ca/uploads/1/3/1/3/131381640/7611814.pdf
    • http://files.meanscenecomics.com/uploads/1/3/0/7/130740191/a67e419b84bfc.pdf
    • http://files.readmyprint.com/uploads/1/3/2/7/132712119/koganurujeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/nopaxezatoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/ditumawomazojusepow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/19638701133.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/7783936973.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/nibejukomibov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/let_keyword_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/zexupiwamutidagos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/21635047109.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/51029274387.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/82709889985.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/66292216207.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_off00009751.bin
8d9ccd248a5fd2d744bf2f5feed4464a2fbdaa19b8f0a0d9d7b06c5a07a7056c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9751 5076 bytes
font_01_sfnt_off0000a898.bin
7730f3e9e9c8e97abff1c6a43874ffd4bd4d2cd57ab3a9d700442a5d881aa09f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA898 13944 bytes