Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb8ac1d12689475…

MALICIOUS

PDF

53.8 KB Created: 2020-08-12 01:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca2cf6ef9ffd0c13214e95799b78c13 SHA-1: dafccfad23bcb1e566aaac0462242a883959d0f2 SHA-256: dbb8ac1d1268947520ff639e94bda2040d5ce9133f3b15cd62808a375316f186
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, which points to 'https://ttraff.cc/pify?keyword=camera+lucida+roland+barthes+pdf'. This URL is likely used to redirect users to a malicious site for phishing or malware delivery. The document also contains a large number of embedded links to various PDF files, indicating a link farm, with many hosted on Shopify. The ML classifier 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=camera+lucida+roland+barthes+pdf
    • http://files.blueroompromotions.co.uk/uploads/1/3/2/6/132681033/4547440.pdf
    • http://zizeteleb.syivan.com/uploads/1/3/1/4/131406799/zenoxun.pdf
    • http://nazixot.damianshishkin.com/uploads/1/3/1/4/131437657/1909417.pdf
    • http://files.dylanriverdale.com/uploads/1/3/2/6/132681398/7322ce71def29.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/99199374068.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/anestesia_raquidea_efectos_secundarios.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/86493864789.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/adverbios_de_frecuencia_en_ingles_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/walmart_w2_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/91246298698.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/mivevib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/20670402166.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/murixide.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/babette_s_feast_isak_dinesen.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_off000087b7.bin
c598b5f76f9a07ad5d9c957dc2c14f2fce9c65bdb38baf0850d2c0b2994d0d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 5440 bytes
font_01_sfnt_off000099f8.bin
711140b8614d1856cba2276470e81a11072e4d926f03ccff1c3fa241dd0b831f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F8 10028 bytes
font_02_sfnt_off0000bc45.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 4324 bytes

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