Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d914d254ff87e9e…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 22:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d853992bc85efbe42e52a48f9f09b7c SHA-1: a7c74e3967dd2125b46833feb1eaba41823194f4 SHA-256: 0d914d254ff87e9efdca340528cc5719e6ae3d7f567a4c8d2cc4b7d80b5bbaa5
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=funcion+de+transferencia+de+un+circuito+rlc+matlab'. This URL is likely part of a phishing or malware distribution chain. The file also exhibits characteristics of a PDF link farm, with numerous external links, many of which are to benign content, suggesting a potential SEO poisoning or spamming tactic. The ML classifier 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/wix?keyword=funcion+de+transferencia+de+un+circuito+rlc+matlab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e6d5c376767f4cbdaf1b5c0ac0765ec8.pdf
    • https://static.usrfiles.com/ugd/f0e51d_8d6de524fbd1401da505d89a09e211aa.pdf
    • https://static.usrfiles.com/ugd/c83fdb_f0efe59a7fd94eed89bc88ec105e623a.pdf
    • https://static.usrfiles.com/ugd/c162b3_a9255173cb324bf7ab700c5875696601.pdf
    • https://static.usrfiles.com/ugd/b8c837_05e071803c274243bc1f846768ad98dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1c8e0aa06f8420399027d1e12471151.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_c9269a067b8a41e1b7f569ab86eb9d61.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/android_material_design_bottom_navigation.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/85263824894.pdf
    • https://cdn.shopify.com/s/files/1/0455/4260/4965/files/98751299131.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/guided_reading_level_to_lexile_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0440/5241/4614/files/2017_chevy_trax_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/ritzer_contemporary_sociological_theory.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_off00005eef.bin
9ecf238b7409b43381cb539efe79acb1c0c9a9d4d6bfa41220a2e6a19e6d9280
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEF 5260 bytes
font_01_sfnt_off000070b3.bin
03905376354e7b7804692ecb292119c01b7959898dbb5e201332309b0bb2daf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 11608 bytes