Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e0fbf85230d7ef…

MALICIOUS

PDF

41.3 KB Created: 2020-11-04 23:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eb3e35e877bf0ce4b4e2e8946c133cc SHA-1: 59fca4220833453b73135c7ebc541ae147c00fa5 SHA-256: 17e0fbf85230d7eff8d5dd68dad635d271763a6949ecffb7ebde15a52143edf9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'imvu credit generator'. The presence of multiple external PDF links suggests a strategy to distribute further malicious content or engage in SEO spam.

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.club/123?keyword=imvu+credit+generator+no+human+verification
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/bamaxowifidowubipes.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/a1bf7a36.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f89d46275365.pdf
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5f97a87272db4.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f924dec1a2e7.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdf
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/guriwig.pdf
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/cac227909fa135.pdf
    • https://jokatilowiwege.weebly.com/uploads/1/3/4/3/134369617/13da8f7bece33.pdf
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/7cd883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/limewub/kiduredesoxuxufukamubeda.pdf
    • https://s3.amazonaws.com/bisute/ancient_civilizations_worksheets.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/lewis_dot_structure_of_cf2cl2.pdf
    • https://s3.amazonaws.com/pewibim/is_snape_harrys_real_father.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_off000061a9.bin
b62d9c3543842ad62d3f6ecae0d0c6503d447db944dd90ef1935c27c76eefd96
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A9 5220 bytes
font_01_sfnt_off0000734d.bin
105e4c511efa2d367953e034c3392bbce6d29f8f27a0d46d5a10c79e6597f449
pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 10816 bytes