Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ecc1b19bf350b0…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb0524fd81384c22e778b3dcb364e8c SHA-1: 1a5b721557e92cb7bfb99e8e0c4600b374ac8b12 SHA-256: e1ecc1b19bf350b0ab0ea043ba3341e816563e500ae38d1b09280116fe397042
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, which points to `https://ttraff.ru/wix?keyword=regime+soupe+aux+choux`. This URL is part of a link farm containing numerous other PDF files, indicating a distribution mechanism for potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body itself contains garbled text and the title 'Regime soupe aux choux', suggesting a lure or decoy.

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=regime+soupe+aux+choux
    • https://static.usrfiles.com/ugd/0e9fc2_b060e602bff846ca9a72b62829ddb97f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3f9580d5f4a4fddb3f5b5633b2ac40e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad930f9d705b458d8c3e80af9d8e9ac8.pdf
    • https://static.usrfiles.com/ugd/724fb5_708981c903f744848fde0d71f0663873.pdf
    • https://cdn.shopify.com/s/files/1/0441/2358/6712/files/walofanufogufule.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2967/files/82797634212.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/96385481268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peregomosurexezobosezob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/ximagegikenumomavaxen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4564/9574/files/30604475117.pdf
    • https://static.usrfiles.com/ugd/93c935_f667f13238b640e7bf96fbaf168f5f3c.pdf
    • https://static.usrfiles.com/ugd/f523c3_55246177eca643c4821ebad1ace9a780.pdf
    • https://static.usrfiles.com/ugd/685707_10decb97d74c43ffbaa0f7237c969cc9.pdf
    • https://static.usrfiles.com/ugd/136d07_8355b9014257466fb6aa6276e0060f47.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b8b50b6c65d44b3a894d9dbbbea10e3.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_off0000618e.bin
a35e542427102d0c0d8f10d8c85ec26101a565596caaec73ca46dc6749189c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 5296 bytes
font_01_sfnt_off00007384.bin
a7e6b3ca71401b82d87edcdab9d1dd239642a78a1b0992321764112a11a550a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7384 11364 bytes