Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd25cf96de71ef82…

MALICIOUS

PDF

38.8 KB Created: 2020-08-10 04:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18786cea29765c72e09b154dca653ee1 SHA-1: a50cfa1e521e55317fbdee37090815b0f0fefa0f SHA-256: bd25cf96de71ef82475729f4c811ddd8ae89dc3ffe256e3c33745d0ea850c0ef
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and text related to an 'automated attendance system project pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. 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.cc/pify?keyword=automated+attendance+system+project+pdf
    • http://files.sdbau.shop/uploads/1/3/1/4/131406749/sibokugepe.pdf
    • http://files.idealadvisoryservices.com/uploads/1/3/0/7/130775813/lepotewum.pdf
    • http://files.jacquelineschiffer.com/uploads/1/3/0/9/130969939/noguw.pdf
    • http://files.turuncapartment.com/uploads/1/3/1/3/131380308/8659686.pdf
    • http://files.submergeradio.com/uploads/1/3/1/3/131398142/gejaxowetu_nimuxowanavure.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/renutibuzudoxetogepabil.pdf
    • https://cdn.shopify.com/s/files/1/0447/9251/2678/files/anemia_microcitica_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/lilip.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2567/files/manazubeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/62915431503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/31206832841.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/zodolatut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1709/9685/files/61623824757.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/kixigiralotokudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/padijetokojuxowugigidako.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/52345832494.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e3b.bin
90d1dee98e4646942de39a69dbf0618d1d2b96dbf329c46ba75a6a0971de701c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3B 5272 bytes
font_01_sfnt_off0000601c.bin
40f6e45f79cf49a8dafeeee9f675789df7f5d2fc9b75ab3468536a98ae4f0106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 9316 bytes
font_02_sfnt_off00007ff1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF1 4324 bytes

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