Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dc47f0e4d0966c…

MALICIOUS

PDF

52.6 KB Created: 2020-08-08 05:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90fbbf8ef828edb3715430a027712a25 SHA-1: 30d561cd986148c62396d0c65efcbf23ab4ef7a9 SHA-256: a5dc47f0e4d0966c9c7579fe5737a7c7631d09b08ac9f3620c5c9c67e8e17222
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.ru, disguised as a free download for a cardiology board review PDF. This indicates a phishing or social engineering attack aimed at directing users to malicious infrastructure. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to increase visibility for malicious content. No scripts were extracted, and the document body is heavily obfuscated.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=the+cleveland+clinic+cardiology+board+review+pdf+free+download
    • http://files.moneytreerentacar.com/uploads/1/3/0/7/130739027/zolobexikoguli.pdf
    • http://files.eternal-roots.com/uploads/1/3/0/9/130969710/1293123.pdf
    • http://files.stitchingfitchic.com/uploads/1/3/1/4/131438059/pefukutenanom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/kr_chrome_fimfiction.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/irrationally_yours_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/beckhoff_plc_programming_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/english_advanced_vocabulary_and_structure_practice_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/8555/4073/files/35996454778.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/luwajanenapog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/some_basic_concepts_of_chemistry_notes_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/guitar_rig_5_preset.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/37475067879.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.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_off00008f54.bin
60d1078b1ce2c4e52a90b1a26ccf65f66121ecbdf99b5de2c8e271d38d40c1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F54 5580 bytes
font_01_sfnt_off0000a265.bin
b0402580856ca3a7035fc8688a03fba791840b86a96ea2c33e0068c2491073f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA265 10104 bytes

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