Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f8f40f35170f73…

MALICIOUS

PDF

42.6 KB Created: 2020-08-17 16:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d31690ca4d43ae2f7ab4c42e9bb4b06 SHA-1: 3256c8660269001d83e04d9f8b891a4cad4374bf SHA-256: b3f8f40f35170f73cd74810150b3a326b61cf77e5c23c4069864edbbc4171c8c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=house+chores+worksheet'. This URL is presented within the document body, disguised as a worksheet. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicates 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.ru/pify?keyword=house+chores+worksheet
    • http://files.epsilonkappatx.com/uploads/1/3/2/7/132712530/wopopebuduw-nepow-daluw.pdf
    • http://files.btmpostech.com/uploads/1/3/1/4/131410818/tojupujev_wavakevajuriwu_vuwamerodevo_zukapanajonun.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/dj_snake_middle_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3932/4325/files/definisi_jantung_koroner.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/50205568624.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0455/files/34979674098.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/73863207972.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/61086144240.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/zowakiwagi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/nuxune.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/iris_biometric_system.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/simpsons_tapped_out_donut_hack.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9100/files/norton_antivirus_for_pc_2018_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7574/files/cartridges_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/wopasojetumufo.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_off00006afc.bin
445b023245f3d249e85aa546f36065765fc84a2cb019222da12909aaabb8a7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFC 4764 bytes
font_01_sfnt_off00007b3a.bin
52ac983db1dad074807bc9a681c85a65adee9a50c56ea1b43361e2f27b942bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3A 10252 bytes

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