Malicious PDF — malware analysis report

Static analysis result for SHA-256 3855d6e6ed0e90f1…

MALICIOUS

PDF

40.2 KB Created: 2020-09-07 05:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c5b314fee983ebc6549680699ad645 SHA-1: 569d7fed268265bdad8018562257a3be74d2529a SHA-256: 3855d6e6ed0e90f1f9ae961b67a11cac01ce2c97fd81622f40063c2b73534791
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL and a benign-looking title about making a manual winch. The presence of numerous other benign Shopify links suggests a link farm tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=como+hacer+un+cabrestante+manual+casero
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/impact_of_globalization_in_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/firered_rare_candy_cheat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/blizzard_going_slow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/turujeripuwa.pdf
    • https://cdn.shopify.com/s/files/1/0465/4684/5846/files/civilization_5_guide_to_science_victory.pdf
    • https://static.usrfiles.com/ugd/bc84a3_0ef8422ac4e54bc2932a9f2dd71d6a27.pdf
    • https://static.usrfiles.com/ugd/b7306e_8a6c27f659d24bc1b6d4b0be4b7bec84.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/tratamiento_para_el_alcoholismo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0241/files/bhoomi_karnataka_gov_rtc_online_report_log.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_off00005e9d.bin
b76cdfe519017ad1222c4bef700c5fcc5edbf78c87502b7b2172e679832492d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9D 5084 bytes
font_01_sfnt_off00006fb2.bin
b7a2552cc2f17c24b0c1c6002403068322b2cdd31dff0a1df335cf6490da85a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB2 10880 bytes

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