Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bd921733710849…

MALICIOUS

PDF

45.0 KB Created: 2020-09-02 23:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa74b912a429aa1cdd03b986229237e SHA-1: 51af8bfef6b44d7050c481cabf7c502992d4a92c SHA-256: 11bd9217337108496ecefb8b13469aa1e3810340d00cf2e49956c14851c5ede6
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised with a lure about car specifications. The embedded URLs suggest a link-farming SEO scam designed to drive traffic to potentially malicious sites. The ML classifier strongly indicates 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.link/wix?keyword=2015+camaro+zl1+performance+specs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34456372212.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/bcs_question_bank_solution.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/riwilatotitopomezej.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/batotejuxuni.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2ed23df8174c8a945b6e9f43d58aad.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd1238f0b46d4037a71f11897567eaff.pdf
    • https://static.usrfiles.com/ugd/b8c837_88832ff918c442568b08c5cada25cd28.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/codex_alimentarius_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/intro_to_world_religion_and_belief_system.pdf
    • https://cdn.shopify.com/s/files/1/0462/1638/0570/files/fivepefega.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3047/files/kodiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/fokopaxuperexakifazirofu.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_off000071e3.bin
c08fdeb1c94ddb58efbdb70cacd4346cca58e00b423c8f2f76d2ee0b778c88ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 5568 bytes
font_01_sfnt_off000084c7.bin
b7b83af0a75d9bcfe38fe5d74c4458523d6b578421fd426888573f125b3db3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 10148 bytes