Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f73c8dae8a699d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-28 15:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c1795342fdd2b1f877251130805ff0d SHA-1: f2cdce2f1ae4c5cb73e87e1a2f9d0f6cb5ab3971 SHA-256: b5f73c8dae8a699dc26ba7e74d30b10ce405db64a01160743272900e30b86403
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute malicious content.

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/pify?keyword=introduction+to+programming+in+java
    • http://files.starkeyoutdoors.com/uploads/1/3/1/4/131452794/joxuvalus.pdf
    • http://files.bambooartscenter.com/uploads/1/3/1/8/131857071/pujeriwetid-napofemerumaw.pdf
    • http://files.marissadaney.com/uploads/1/3/0/9/130969429/vetufaxu-tewizolew.pdf
    • http://jojevul.clanchildhealth.org/uploads/1/3/1/4/131438563/putuxexiwone.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/36923258909.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/plant_genetic_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0435/8474/9729/files/can_you_edits_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/genetics_mcqs_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/wewize.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/76977385019.pdf
    • https://cdn.shopify.com/s/files/1/0434/8274/2950/files/resident_evil_5_versus_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/saab_9-_3_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/2106/6393/files/jezerepamif.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_off00006fa1.bin
efd858c233e7b3529b73130c9592e56dce892ba21339fb92bd28c2c76e4ceb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 5256 bytes
font_01_sfnt_off00008178.bin
f370a369b2f2c6e9b727d0bac1cf0c02c952260a172fc06040d285d673be106e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 10304 bytes

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