Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef37a22619777f1…

MALICIOUS

PDF

44.3 KB Created: 2020-08-16 11:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de41d77eed4e80d36ceb02e9eb345689 SHA-1: ed0cbd72bbace487e6a53a6c53cb683791040dd5 SHA-256: fef37a22619777f152662356235afda457ce675a90c1cd52a40a1df6b63fa589
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=aseptic+and+antiseptic+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and heuristics point to a social engineering lure using a seemingly innocuous topic to drive clicks to a malicious URL.

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.com/pify?keyword=aseptic+and+antiseptic+pdf
    • http://files.oldtrail.shop/uploads/1/3/0/7/130740551/26e1e98b64b1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/acids_in_fruits_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0328/files/kifemezulibewewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/fuxix.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/manual_of_structural_kinesiology_20th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/8750447942.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/31951365725.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/puxigowivinepone.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/nogufadip.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_off00006bea.bin
d5f04d43d90a9c12bd1416b2f8e6ae6f6444d20445f9461005a96ac794234e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEA 5012 bytes
font_01_sfnt_off00007d05.bin
a7942b3df55d6f00fd8ef8fcd42cf9b17fe149c56038378b1e2cbbf793872dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D05 11900 bytes

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