Malicious PDF — malware analysis report

Static analysis result for SHA-256 179ea58a228c0f51…

MALICIOUS

PDF

65.4 KB Created: 2020-08-09 09:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0191d21f5264c7ab9e87fce6a3b91e SHA-1: f3a5425cb48b8f2d9c9622fedf177622f6741c51 SHA-256: 179ea58a228c0f5172992ec85474f888d18ba316f6774437845210e4bfbee9b7
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, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise malicious activity as legitimate content. 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.com/pify?keyword=calculus+chain+rule+problems+and+solutions+pdf
    • http://files.abundantlifebaptistwashpa.org/uploads/1/3/0/7/130775980/zovig.pdf
    • http://files.happyhikerruidoso.com/uploads/1/3/0/7/130774962/sunusiduvelisa-gewixozujojiru-xilewez.pdf
    • http://files.cmcasantaart.com/uploads/1/3/0/7/130739267/tokofuziridi-puwareb-makipuz.pdf
    • http://pumunor.dandpvirginhaircompany.com/uploads/1/3/0/9/130969742/2966b127.pdf
    • http://files.thegrownupsbenefit.com/uploads/1/3/1/6/131606390/8b31c76e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/90450503184.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/dragon_ball_flash_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/3118/3016/files/mapa_metro_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/letarirunisek.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/motoguxesudekumiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1841/8333/files/bruxismo_diurno.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/administrao_da_produo_e_operaes_moreira.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/aviculture_en_zone_tropicale.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/49969568617.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/komiligixutokuxapewuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2965/files/16328406924.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/50889402601.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_off0000b295.bin
e3831b2de01db1e161ca6ee7cf2c6bad6248045a8c2b7273536af62e8e6b007e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 5440 bytes
font_01_sfnt_off0000c4d3.bin
7024fda959bf76051e56662c227c2c5b5660e57685d885aaa6bf02f4feb40344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 16912 bytes

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