Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb7a8ea5bfdadaf…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 19:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c83c052ddb8fdff6a42d7f197a9246 SHA-1: b5c0e5f44da52f6c18c8bce3cb5e1f2c553452db SHA-256: 2bb7a8ea5bfdadaf13798bec3607bb84083c4d7412554e05ae0f8622d630ea1c
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, pointing to 'https://ttraff.cc/pify?keyword=miocardiopatia+dilatada+periparto+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including suspicious ones like 'http://xuzenup.runninsranch.com/uploads/1/3/1/4/131437626/wikerepoviravabik.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same suspicious URL, reinforcing the lure. The primary attack pattern involves redirecting users to potentially malicious content.

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.cc/pify?keyword=miocardiopatia+dilatada+periparto+pdf
    • http://xuzenup.runninsranch.com/uploads/1/3/1/4/131437626/wikerepoviravabik.pdf
    • http://files.lyndonsga.com/uploads/1/3/1/4/131437276/0ea2715e5.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/zikinugib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5169/files/acute_gastroenteritis_in_adults.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/alaipayuthey_movie_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/ambassadors_of_christ_choir_videos_free.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/gozorilajozupuwomijaxid.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6226/files/fukirekade.pdf
    • https://cdn.shopify.com/s/files/1/0440/3088/6053/files/surviving_sepsis_campaign_ssc_guidelines_2012.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/east_african_history.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/granblue_unite_and_fight.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/xajivifipiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe4.bin
88e75b05dbf74559f558662111cbe706707b95ad3ed850de95044709717bd5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 4660 bytes
font_01_sfnt_off00006fc9.bin
0809c28d27db43541845261cb6fa10fda0211dd1e63d670434fe048be9740447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC9 10104 bytes
font_02_sfnt_off00009252.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9252 4324 bytes

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