Malicious PDF — malware analysis report

Static analysis result for SHA-256 257c3eeb3ddfd5f5…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 17:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34cf1b99ac7e00c07c4708ca592d3fd5 SHA-1: 5af8364677991c9553c0b80284883056057de80a SHA-256: 257c3eeb3ddfd5f505dd05d97f59067f36ef4c11c7523e285bfea40bec7d3c1c
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many pointing to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=subject+verb+agreement+all+rules+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to 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=subject+verb+agreement+all+rules+pdf
    • http://files.goldenfoodbank.ca/uploads/1/3/2/6/132695574/5479926.pdf
    • http://kenude.companyh26th.com/uploads/1/3/2/7/132740978/554118.pdf
    • http://files.gromowskilawfirm.com/uploads/1/3/1/4/131438397/6865569.pdf
    • http://bomeb.aliciawillspettit.com/uploads/1/3/0/9/130969352/laxebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/noborogok.pdf
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/34770475064.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/duwovoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/maytag_quiet_series_200_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/sozow.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/45432948846.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/87642177817.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/78933078897.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/github_compare_two_commits.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/poe_prophecy_wand.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/2675279882.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/suzuki_side_kick_parts.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_off00006250.bin
c0a01b42f8dc5f980ce04f9630ac3f20ede02eada77013d9c0b3c22a73efb961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 5580 bytes
font_01_sfnt_off0000753b.bin
6a172aa7565f13427aea1d5e7a72925e22a1a6858fed01b6e6fd9a2125cd35d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 9972 bytes
font_02_sfnt_off00009742.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9742 4324 bytes

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