Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8d320dab064762…

MALICIOUS

PDF

59.3 KB Created: 2020-08-31 07:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12548da64f841d752d4ef9e02bfd05d3 SHA-1: fcfe2b227d1cd179549c8e22f918d46235527ad3 SHA-256: 8a8d320dab0647628fde2d5d18c7abe14cbf99e3f585bacbbf620acee5ea33f8
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=acts+prayer+model+bsf'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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/wix?keyword=acts+prayer+model+bsf
    • https://static.usrfiles.com/ugd/01bc73_7b36f112d7e146ee9a0084405fc4fc4a.pdf
    • https://static.usrfiles.com/ugd/87a178_59a6f513567243bbb3429573e41a5fa0.pdf
    • https://static.usrfiles.com/ugd/ed64d2_ee456ac832fb4aceb704474d6ff895d4.pdf
    • https://static.usrfiles.com/ugd/9904c2_527d662b3ca74f21beb2cec4346565f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3875ed58e4479f9257bb919d4fccaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/8089/0008/files/74779129189.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/21821412885.pdf
    • https://cdn.shopify.com/s/files/1/0452/0201/4357/files/25018109673.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/66853791406.pdf
    • https://static.usrfiles.com/ugd/384ea4_e0cfcee3d37d467a89837b87f5a3b320.pdf
    • https://static.usrfiles.com/ugd/f515ca_381b0a4d91f445ae99520959749121fc.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_off0000ab5a.bin
88623f41d23a0545e074d9e2a837cbd716473089e3b56a761530c55aac90c0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5A 5532 bytes
font_01_sfnt_off0000be13.bin
8ba17dba336dabb3363192e2f62ea21d8705483d04b32ef7137a64f91988710c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 10036 bytes

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