Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33fa97e9e273c88…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 07:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8422d36eb50e337dc097919b96c38d9 SHA-1: cc280033f343caa1faa50e64e5a688ca29ad3a3a SHA-256: f33fa97e9e273c88dd7a72d90a09bc98f8b9fd8f48d26fd9beba8561d1b8425e
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. One of the primary links points to 'ttraff.com', a known malicious redirector. The document body contains obfuscated text and embedded URLs, including the malicious redirector and a Shopify-hosted PDF. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=d+sign+collection
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/craft_c2_a0work.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/sefujeroron.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/lazozopetod.pdf
    • https://static.usrfiles.com/ugd/e745be_5f7c66e8eede415a8639030b84f76113.pdf
    • https://static.usrfiles.com/ugd/afe78f_041aeee1215447679e5525e7d4028a6e.pdf
    • https://static.usrfiles.com/ugd/87a178_45ecf1bda84e45c6b63c68a9cadad625.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a23793e39214501a84623e8fb0e75d6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/addition_and_subtraction_facts_to_20.pdf
    • https://cdn.shopify.com/s/files/1/0463/2667/7665/files/Spiel_killer_app_keine_Wurzel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/ce_marking_medical_devices.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/19841369008.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/mugozenujefosubuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/23850960735.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_off00005fe1.bin
d41d92ed7b4af9146faca78117cdaf09089425421361a2f41b1f2e613423b835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE1 4660 bytes
font_01_sfnt_off00006fd4.bin
ca561c9ae3df8f8bde766d90911c884bc379f6baa359e95d94226a8a3e2f609f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD4 10168 bytes

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