Malicious PDF — malware analysis report

Static analysis result for SHA-256 16963403b5a28c9e…

MALICIOUS

PDF

38.8 KB Created: 2020-08-20 06:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa8e581db1597eaa0d75c964ece4a81 SHA-1: 4c70f4ae6f54e7478c598095cdeb2195f92402d4 SHA-256: 16963403b5a28c9e46928440d28d0e4578853def6c130c3ac0302df9423a4f62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a link farm designed for SEO manipulation. The document body also contains a URL that appears to be a lure for game cheats, which is likely intended to trick users into clicking through to the malicious redirector. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=counter+strike+1.+6+cheats+free
    • http://fodof.bitaffinity.org/uploads/1/3/0/7/130776585/5747079.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/64407189995.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/54995172874.pdf
    • https://cdn.shopify.com/s/files/1/0431/0905/6666/files/45844187930.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/mogujedagajovarovopajej.pdf
    • https://cdn.shopify.com/s/files/1/0437/6920/0791/files/adobe_photoshop_tutorials_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8917/files/sebejawokodanuzosasena.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/35309310106.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/aalayamani_movie_songs_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/lufokuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/40493761369.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/guvaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/3060/9063/files/capablanca_endgame_book.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b57.bin
d2aeec9d132a2c2c965efde3fcb7b2d32496e5d8927339a871440667492af16a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B57 5144 bytes
font_01_sfnt_off00006ce0.bin
7103460377e32196458170ee98a7683a8c20bb515e8e2166862b869d0ea7d7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 9888 bytes