Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dc5eb5b8d2c6fd…

MALICIOUS

PDF

38.9 KB Created: 2020-08-22 07:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389d5dcd33ce636b08b4496c1c83a5d2 SHA-1: aa86520dcdf001f9c4434ea091aa5dc94d53140a SHA-256: 50dc5eb5b8d2c6fdb33f63b48b742a80ade79e02f8a35594cec3712d6c176161
92 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised as a "Ms word gantt chart template". This indicates a social engineering attempt to trick the user into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=ms+word+gantt+chart+template
    • http://tewet.calblazebaseball.com/uploads/1/3/1/4/131407226/xavudukub-jadaxese-pativulikam.pdf
    • http://files.mazcan.com/uploads/1/3/1/0/131070866/legazijivodimowoluv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/41394121697.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/76485906282.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/devious_maids_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/24927486859.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/fulevume.pdf
    • https://cdn.shopify.com/s/files/1/0430/8041/7447/files/kuxisemuresumapitemipuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3418/9734/files/edgenuity_topic_test_answers_geometry.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_off00005bbe.bin
92205d800ffaf4e0ab9778ea644bb5854c244b40b3463e84abe4a53b21b422a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBE 5584 bytes
font_01_sfnt_off00006ea3.bin
c4fa39b5cfdbbfb33dd86407f430bd7bbf2a12a9938e22fde8e9039b47621185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA3 9540 bytes

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