Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e2b862ecfff436…

MALICIOUS

PDF

74.3 KB Created: 2020-09-03 00:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5867226f72686f98babc265d2f4e78 SHA-1: 3b685870a4550e256f38b6c1d9d0626184f5e238 SHA-256: 91e2b862ecfff4367dbc667184b7ef06a07f6b7a6f86b4f855b604a65379e197
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a search result for a 'front desk manual template'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive document title and a malicious link designed to redirect the user to harmful content.

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.ru/wix?keyword=front+desk+manual+template
    • https://cdn.shopify.com/s/files/1/0459/6213/3663/files/kuverel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/curriculum_guide_in_mapeh_5.pdf
    • https://cdn.shopify.com/s/files/1/0448/0968/3110/files/ahir_bhairav_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0449/4213/1355/files/spatial_analysis_modelling_in_a_gis_environment.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/20309085938.pdf
    • https://static.usrfiles.com/ugd/a18aa6_4d64e29925dd48da9d999b4f221ee18c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a1c879dd25f4d749d38b057a80c2973.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa6b8dff86a4d399fb9527455677dd3.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_790c5f3ed559438291de7238620cf66a.pdf
    • https://static.usrfiles.com/ugd/cf14a4_00ff9e9a875c43cc8d255f18715d8f0d.pdf
    • https://static.usrfiles.com/ugd/48f461_f620f9e54bb14d83bd1b81ebdaf54631.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_fff126b4ecbd4fcfb83fdd20ebf8653d.pdf
    • https://static.usrfiles.com/ugd/29c71c_439e58c508884705bebfd2f3e228b30b.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_e9b91a7dab79448a9d48d54c4629d560.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_off0000e7a4.bin
00fb5faf651e7a7440e49d82134208db25c48cd3e4a523b041fbfda82b077395
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5124 bytes
font_01_sfnt_off0000f8fd.bin
44e1618aee78c28b95cea9bd51ee54f698c95e8b51d1dfc3c878729ac6006866
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10336 bytes