Malicious PDF — malware analysis report

Static analysis result for SHA-256 4776e9c986ec59d0…

MALICIOUS

PDF

37.5 KB Created: 2020-08-02 04:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d355b1e1709fb49118900ad2ee5a66b6 SHA-1: c96a6a211be426b370e77e44b9cee8ad6c3df860 SHA-256: 4776e9c986ec59d01d31d26ad05ff2edb744912f170c7c5754cc0826af483ee1
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious redirector URL and numerous benign-looking PDF links hosted on Shopify and other domains, suggesting a link farm designed to obscure the malicious destination. The primary attack pattern involves luring users to click on these links, leading to potentially harmful 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.com/pify?keyword=simple+wildflowers+wow
    • http://files.saskatoonpickleballinc.ca/uploads/1/3/2/7/132740278/vikesibozud.pdf
    • http://files.miamiccr.com/uploads/1/3/0/8/130874254/vuwegirujiko-rikuneb-ditojodib.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://files.ckumaresan.com/uploads/1/3/1/4/131409017/porizi.pdf
    • http://files.laurenmmcollins.com/uploads/1/3/1/1/131164446/6470068.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/wamukoxeridoze.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/gadolafaxibaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/fovamufuwofigejofovuxujet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/25593892321.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/53287211706.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/gobovafewak.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/pilonopixinevotipubate.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/moreluliwifigaludexab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/zorapeboboma.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/pajesibinosawibisato.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/rapebovututazabisinozod.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_off00005605.bin
6ce2384b4f791cbbe14e6ebf97d72d01b7670cafd5fe0aa04f30ee16135c46d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 5172 bytes
font_01_sfnt_off0000679c.bin
67d6795b2c45c69143c1fa1533c53200edfb36e3bed552f02c48d682555d7515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 9944 bytes

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