Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1e400863ea8b36…

MALICIOUS

PDF

42.0 KB Created: 2020-08-21 04:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5eb160e7adf0dcd39999b12522b4b68 SHA-1: be71ffa9ce0609ee6330d76214b57c28b8f0f378 SHA-256: de1e400863ea8b366ba2976c0cbdedeeb1f1d0ca6de881cd717ca0dc45418c83
152 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=neoliberalismo+en+peru+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 farm or SEO poisoning tactic. 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=neoliberalismo+en+peru+pdf
    • http://files.heclab.org/uploads/1/3/2/6/132681482/roxapilinojakupudol.pdf
    • http://sojad.waynetownshiptrustee.com/uploads/1/3/1/6/131606122/9508350.pdf
    • http://files.lwcmusic.org/uploads/1/3/1/3/131398022/wozijapusup_vijabotumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/17790545559.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/global_warming_and_greenhouse_effect_essay.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/vazuvimavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/42910034031.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/p_square_shekini.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/gidijop.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/cathedral_rock_national_park.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/isaac_asimov_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/tidulevivex.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_off000063ea.bin
ce0d9f3f21982343cd17cc835379489861ace72ff4d06aefe7440fe411e8cde7
pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 5296 bytes
font_01_sfnt_off000075c2.bin
f95d4e0da74c2d94e56dcd651dea4002bb8b1a9ebb1909877c1f02b68edd7980
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C2 11204 bytes