Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af08a653aed6db0…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 13:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 086e853e691f9d192722ac0a6c4cdb52 SHA-1: 5b8b179537326eafd5e398b8d46398d818ffaf70 SHA-256: 3af08a653aed6db04c7c91b32af37d03a9d33e6c44f24f352351bb7208efa419
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be corrupted or contains minimal readable text, but the presence of numerous external links suggests a link farm or phishing attempt designed to lead users to malicious sites.

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=bass+guitar+chords+sheet
    • https://static.usrfiles.com/ugd/5360f8_46216440c7224ae58cbda2964be40e6e.pdf
    • https://static.usrfiles.com/ugd/26938b_c6e42cd6ab5842008495a7d0abc4c767.pdf
    • https://static.usrfiles.com/ugd/0dd040_87ad4e5008bf45688d1c8c5c8893c155.pdf
    • https://static.usrfiles.com/ugd/4117a9_c09e3842083547aab097a0f8646711c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://cdn.shopify.com/s/files/1/0428/7778/0134/files/mademod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/time_tamil_movie_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/44335027570.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/resovor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/82188708233.pdf
    • https://cdn.shopify.com/s/files/1/0460/1102/3519/files/branding_guidelines_template.pdf
    • https://static.usrfiles.com/ugd/5360f8_ce5026a945ed472faa9a0445be43c577.pdf
    • https://static.usrfiles.com/ugd/f4de5e_927ff987ad4d4aa59d753e1754b03a08.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_5662a0ba2ca44f3085c7f67c40e2eb6f.pdf
    • https://static.usrfiles.com/ugd/b48b60_76db74773c604bdba785194db09dfef4.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_off0000612e.bin
bcb4065ca28b440d5e56661371b0b2d71557575f1d44a094596cce674112c1de
pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 5216 bytes
font_01_sfnt_off000072e3.bin
0dec474bd4454b045ef6e29980d70c1bbb1bd695a8535c448f4e8186130c5d14
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 10128 bytes