Malicious PDF — malware analysis report

Static analysis result for SHA-256 839c0e56f1c2cfa7…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 14:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68102f12e019979669ac5f901cfd8b6 SHA-1: 908ef706ca85de6d5f2730a0330b2b46e8f0bbb7 SHA-256: 839c0e56f1c2cfa7b3716f2f6608fb9d402c08eeb417b84cc98c5e5e08ec641b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a tutorial on 'sourcetree tutorial bitbucket pdf'. This redirector likely leads to a malicious payload. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility of the malicious redirector. The ML classifier strongly indicated maliciousness.

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=sourcetree+tutorial+bitbucket+pdf
    • http://files.stalbanstpetebeach.org/uploads/1/3/1/3/131384101/vibisetefizugora.pdf
    • http://files.homeofourown.org/uploads/1/3/1/3/131383864/9439629.pdf
    • http://files.hobbyhardwoodalabama.com/uploads/1/3/1/4/131482826/b05497c9d.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/82728254875.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/risamibogebimizixeva.pdf
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/tuwofubitesosofixoxil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/58946130890.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/pakedu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/axis_bank_fd_interest_rates_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/pomuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/rojemebeloditoleta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/banking_service_chronicle_march_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/39290510695.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/chicken_and_dumplings_paula_deen.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_off00005ffe.bin
870d4bff07b1c242ff646ed1fa9e7c1b2683c54e65234290e7a9b50fd00125d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 5276 bytes
font_01_sfnt_off000071f6.bin
7ba23e21f8636909d6f5f44e4510b49a2dd0adaa669ab578b46b5ae418578898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 9888 bytes
font_02_sfnt_off000093fd.bin
f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FD 16208 bytes

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