Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c1b1895fd29249…

MALICIOUS

PDF

37.8 KB Created: 2020-08-23 16:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75bf73052c9768be44fe0d84d8e8e491 SHA-1: fae2c8807ac71bc1a240aba399ea12c528e735e7 SHA-256: 26c1b1895fd29249fa1b0ff6b9d7708821698c3ce11fc05b888215386f360254
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.ru/pify?keyword=fraction+decimal+percent+conversion+table+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The document body, though heavily corrupted, contains fragments of the URL and mentions educational topics, suggesting a lure to disguise the malicious intent. The primary attack pattern involves tricking the user into clicking the malicious link.

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=fraction+decimal+percent+conversion+table+worksheet
    • http://files.careholisticcenter.com/uploads/1/3/1/4/131437322/8528ef58199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7614883084.pdf
    • https://cdn.shopify.com/s/files/1/0447/4798/0951/files/zaromikizovigoruvax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/zawesosogurupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/sotomedivipewulesapegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/bank_clerk_exam_study_material_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/bifowetake.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/integration_of_hyperbolic_trigonometric_functions.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/xusaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/7643028202.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_off0000540c.bin
d9feacc69a91e85793ec80c41f28de9730f0a37464ee0645dfa3e9cd9321f90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540C 5624 bytes
font_01_sfnt_off0000670b.bin
a61ed3672984710c7c702cf50357405a46b83bd4aad5a434fcfba5874547c048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670B 10756 bytes

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