Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2851f2286b57a3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 11:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f0fcefd654d4cbebb1900792f39f494 SHA-1: ab396e29792994aceb408bfc6aa41eafc1c62c3c SHA-256: 0d2851f2286b57a3d9d41f7127f290e5227f7ba8684c17e448b0123435203f5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Bently nevada 3500/53 manual'. The presence of a link farm and a critical heuristic firing for malicious redirector links indicates a high likelihood of this document being used to drive traffic to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/wix?keyword=bently+nevada+3500%252F53+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ac51ce_c396d0198d8446b9b77b7200bc6cae77.pdf
    • https://static.usrfiles.com/ugd/850f07_13bfad94caff44e78a0a38e4350a0e92.pdf
    • https://static.usrfiles.com/ugd/bb13a2_7b808b9de440432bbf540dc40ab6f371.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_ce3950f839444947bd17646611cd05c1.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_d6e0bbfec30f452e8d0f7169f619b61f.pdf
    • https://static.usrfiles.com/ugd/eb6612_1754f7d32287485abcbf3d41499aa1b1.pdf
    • https://cdn.shopify.com/s/files/1/0461/0981/9043/files/zesururavonu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1173/3664/files/classification_of_antidotes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8234/1781/files/78322067243.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/sugubiregob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/23864476167.pdf
    • https://static.usrfiles.com/ugd/97368a_183dac53f866481e9fcd869746f3a2f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa95854cc88841c696f29247252cd6fa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b0.bin
9cdadb676a00d21107a6ca26343498ef0680964859959a5021c8df2a6fcbe286
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 5376 bytes
font_01_sfnt_off000075fe.bin
028730ae0092dd42c9ff69af7615b769d6d71f2852256108446a20ba4edfdb34
pdf-font-stream PDF embedded font (sfnt) at offset 0x75FE 11076 bytes