Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc53b51de8a34477…

MALICIOUS

PDF

49.1 KB Created: 2020-08-12 15:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1357ea89ea1358f1c8b2ba6af1576ef8 SHA-1: e30a5a82a454779ace3a3c4d6e18889bd6a853c4 SHA-256: bc53b51de8a34477d0ff7f444bd89ae33cbc5d6084b85aa6c87b7b10e150f8d3
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and several other URLs hosted on Shopify, likely part of a link farm.

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=caudillos+de+la+revolucion+mexicana+pdf
    • http://files.mocommunitytrees.org/uploads/1/3/1/6/131607010/wojodikoji.pdf
    • http://files.custom-mfg-eng.com/uploads/1/3/0/8/130815058/pojepuledetizob-tukapawuvav-furetet.pdf
    • http://files.soulful-body-mind.com/uploads/1/3/1/6/131607075/tujef_zipise.pdf
    • http://files.credorecoveryministry.org/uploads/1/3/1/6/131636728/jelowivotisoju-zilurababud-lewinutulasane.pdf
    • http://files.linesidephotos-europe.com/uploads/1/3/1/6/131636949/5716912.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/lugajobepipekur.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/48303754066.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6730/files/country_boy_aaron_lewis.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/24946842698.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/6553884263.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/80332049591.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/7681844032.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/computershare_transfer_wizard.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/64918143756.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/gedituzanixanebasoxoduj.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_off00007405.bin
0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 1696 bytes
font_01_sfnt_off00007c2f.bin
7ffc516ffea6e5e5d7ba7066f4c762dab87b2d4be1db6b4783190713e512d606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2F 5336 bytes
font_02_sfnt_off00008e41.bin
ac38ef51576936ceca080072ade810a4d247b58131f773bb63ba1df952da258b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E41 12316 bytes

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