Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10974a2a5442c7b…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 23:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfba0d9b0993b78e71cadb27ceb51d9 SHA-1: 83e39d8273dfe29cb8937f50463a8c5b71a1a3d9 SHA-256: b10974a2a5442c7bee62850636b8daff92c277d5020de3a74f87c1c25e9171ef
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=vimeo+video+link+er'. The document body, though heavily obfuscated, contains this URL and other URLs that appear to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is a lure to a malicious redirector, likely to host further malicious content or phishing pages.

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.me/wix?keyword=vimeo+video+link+er
    • https://cdn.shopify.com/s/files/1/0434/1150/5302/files/zerojegivamem.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/jebotedesuveb.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/gofidulorozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/transfer_notes_from_iphone_to_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/gosezawodobuxez.pdf
    • https://static.usrfiles.com/ugd/1d64af_2aeccb657cd2439786f7ee8819a96499.pdf
    • https://static.usrfiles.com/ugd/b8c837_e74b192ddd1b4f3e8f1d9e7986e3cbf2.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_b3941e7cc129442a8f5fe2ea423ffa0a.pdf
    • https://static.usrfiles.com/ugd/bb13a2_f684141728f24ba7b7dc52c79ef2c62c.pdf
    • https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/timesheet_calculator_geek.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/60470392683.pdf
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/acknowledgement_letter_for_receiving_documents.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/concurrence_pure_et_parfaite_exercices_corrigs.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_off00005a13.bin
35d6d9acbf0045fa5de5b461285f825b0c9c93b6ba2ffe4175cd25ed8deb4957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A13 4672 bytes
font_01_sfnt_off000069eb.bin
20e6ef9c80c470e026ed39ab79b77ac720b544648ecfa6f8a6ec0bbd741eca0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 10440 bytes
font_02_sfnt_off00008ddd.bin
e0f8182a1e2a5df71ce0e775f37948a24d08c52d3e360757cb7f9f2974284939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDD 16324 bytes

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