Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a6d6de9de4d3d6…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 03:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24713da6a9359bd8a15b602e72181c6f SHA-1: 2f3df3092643f822854fde69b7a73645b242f033 SHA-256: 50a6d6de9de4d3d66c9a995f6a1ec76aec4badb521b602c22df56e260939e432
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body contains the URL https://ttraff.com/pify?keyword=emotional+development+in+childhood+pdf, which is likely intended to trick the user into clicking it. 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.com/pify?keyword=emotional+development+in+childhood+pdf
    • http://files.199boxingwrestling.com/uploads/1/3/1/3/131381112/xefezejuzegamenonola.pdf
    • http://files.southernstyledevents.com/uploads/1/3/1/4/131412558/2d2a66e58e.pdf
    • http://files.joeynewfield.com/uploads/1/3/0/8/130874058/vuzuxubelali.pdf
    • http://files.lynnwarehousing.com/uploads/1/3/2/6/132696330/wubage.pdf
    • http://files.westpointclassof1968.com/uploads/1/3/2/6/132681325/xumomonosipevamet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/sexanik.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/39494864621.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/6152863186.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/48578165570.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0429/7087/4009/files/monster_manual_ii_1983.pdf
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/los_orgenes_del_neoliberalismo_en_mxico.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/wokuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/jifukezukirisot.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/lizos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007343.bin
8233f31d8000a5ef4c5075676d37b81ca08ff38cd5b9a5e3874a09cb8efdeacc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7343 5136 bytes
font_01_sfnt_off000084a6.bin
c53702b8d8ad06771b14e58ea8c36158414182518ee2288e4953f94ddf25404f
pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 10020 bytes