Malicious PDF — malware analysis report

Static analysis result for SHA-256 75db7c15b2e1b96e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-21 01:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb2e1bc8fe7d33ad9c8980608c1536e9 SHA-1: f5868a17f1faf26da400127d9713dad7e5360cc2 SHA-256: 75db7c15b2e1b96e2ef67410daeeb4d40237e6d348f94cb2b08dbdd24df4b8ce
150 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous benign-looking PDFs hosted on Shopify, but also includes a critical link to a known malicious redirector at ttraff.cc. This suggests a social engineering attempt to direct users to malicious content under the guise of educational material. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=factoring+quadratic+functions+worksheet
    • http://lukiz.marquialewisfoundation.org/uploads/1/3/0/7/130775735/narezuwiwijivaf-legenexusid-sexaxajig.pdf
    • http://files.alexisborth.com/uploads/1/3/1/4/131411688/dupatimevin.pdf
    • http://files.created4youfoods.com/uploads/1/3/2/8/132814958/pakugiwew.pdf
    • http://files.fingers4hiretranscription.com/uploads/1/3/1/4/131437770/ruxojaponewi.pdf
    • http://reledatuk.furryzines.com/uploads/1/3/1/1/131163599/noxifuxug.pdf
    • https://cdn.shopify.com/s/files/1/0439/5024/3995/files/good_aquaculture_practices.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/how_to_install_eclipse_in_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/kaxavujigunal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5316/files/crochet_patterns_book_300_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/76725051531.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/google_slides_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/adding_fractions_with_different_denominator_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/50305394798.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/rubitebavinuwiriko.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_off00005a8f.bin
0a26a8f99ff7cff09412b3e99c921ce3fb12183901240fdd43dc8c096a274b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8F 5488 bytes
font_01_sfnt_off00006d40.bin
014ac85e723a80fe75118c72143776ef48b176f3c81a6e2b7b0d2096824db79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 9880 bytes

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