Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ad2619fbdd5988…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 22:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ec24a643be918ac72872d465aa5935f SHA-1: 4fad8d0d4d272e344f82990eccb3359991a791c9 SHA-256: 12ad2619fbdd5988f4604c29e1139d29903fbb0ba76f41cf6bab754c8681de15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a direct link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains the same redirector URL and references to guidelines, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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=acute+kidney+injury+guidelines+pdf
    • http://files.your-ghost-writer.com/uploads/1/3/1/3/131380052/zajujomizo-wabone-pewejubowixep-jupipixal.pdf
    • http://files.poetriinmotion.com/uploads/1/3/1/3/131379594/4917021.pdf
    • http://files.merrysny.shop/uploads/1/3/2/6/132695339/wubidemipizigad.pdf
    • http://nukugos.tshirtcompanycharlotte.com/uploads/1/3/1/4/131406202/061b7d2b.pdf
    • http://files.millerblade.com/uploads/1/3/0/8/130874575/bizumopabapalun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/68723288978.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/29154844043.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/speech_writing_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/2763716381.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/32096256737.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/tikidebowuwadabosinenemaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/jamimisa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1014/files/48185085205.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/88868323664.pdf
    • https://cdn.shopify.com/s/files/1/0451/1108/3160/files/novena_a_san_judas_tadeo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/raxepuxidavir.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_off000063d9.bin
abc36065d06a2ea92d161d0fa9f89a1446140462c1367fceb12490a5ba4a036b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D9 5344 bytes
font_01_sfnt_off00007629.bin
5c55c1652a0dcfe5743a22746e938da4c8324025b7b04f46c2936b0341eb6aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 10408 bytes

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