Malicious PDF — malware analysis report

Static analysis result for SHA-256 27903e8a2dc2d685…

MALICIOUS

PDF

52.4 KB Created: 2020-08-29 13:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10abb2f2f4d1780fe2744e6bb1bf7379 SHA-1: 4970fe39d5c466a6cf17043c61ff260a0edfd706 SHA-256: 27903e8a2dc2d685425401569d0ad885a69b61b8e8384898681388d9bd5b9452
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru. This URL is embedded within the document body, disguised as a search result for music. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to the malicious redirector.

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=mobb+deep+life+of+the+infamous+the+best+of+mobb+deep+zip
    • https://cdn.shopify.com/s/files/1/0437/3869/3797/files/25692085479.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/bearing_selection_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/aldehydes_and_ketones_laboratory_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/fifarobup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/navemedetipogiwesil.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/comptia_network_exam_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/pozazodikabutabipa.pdf
    • https://static.usrfiles.com/ugd/b8c837_045c7a683e3b4c32bcab05f62dbaa407.pdf
    • https://static.usrfiles.com/ugd/0baf77_4e625cd7c5694e0ab9f174082e765836.pdf
    • https://static.usrfiles.com/ugd/b8c837_1759c73adf104445942996fca028848e.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_off00008235.bin
40fffcf8296620470875b58cc453ca5f73ee38df507c20022fd6b2d5aef34ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 5380 bytes
font_01_sfnt_off0000945d.bin
7dc793de93591cbd34cc502e2af3112ea3128e8a659381ee3dea4594c74d6076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945D 15488 bytes

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