Malicious PDF — malware analysis report

Static analysis result for SHA-256 85485466eb557bb3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-09 08:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0223b8b40339aef0890b7acd2c2f8a5 SHA-1: 79a7c102b7a43c526ee70e15ff7200a5e65c07cd SHA-256: 85485466eb557bb38e5f6ff2f935c2ae6174cd8e4d8926e614a2769b844cdac6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=los+5+acuerdos+de+la+sabiduria+tolteca+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link-farming or redirection-based attack. 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=los+5+acuerdos+de+la+sabiduria+tolteca+pdf
    • http://files.classiccityfirewood.com/uploads/1/3/2/6/132695568/a6312eaa672985.pdf
    • http://wufobo.justdoitcomputers.com/uploads/1/3/1/0/131069839/dilomirigodajaj.pdf
    • http://doxevu.jlsmither.com/uploads/1/3/1/1/131164312/8933318.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/28789329748.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7605/files/saab_9_5_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/21976615532.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/print_3d_from_sketchup.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/luputivutogizejiwajuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/45754503744.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/kite_runner.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/womimitomukivosorur.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/29007730199.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/xezegifase.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17524121831.pdf
    • https://cdn.shopify.com/s/files/1/0435/6918/4931/files/9682800590.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_off00006b56.bin
c85dd1221f0ba356ae3adf25060f06d715077b99d4ca6b0ba4d677f905bc19e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 5356 bytes
font_01_sfnt_off00007d9b.bin
709024d47d701177426935f95f52a7a90f92cf1e82e2ce5ecebee1cea895dacc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9B 11488 bytes