Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e202bb345140e7d…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 17:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa451239a85b75388517c274a237077 SHA-1: 936182cf038fa826e97483bff438edde90fef027 SHA-256: 5e202bb345140e7d2ee136d435ccff616fe9e4eca5caf19fb61193c57bcdb432
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO spam operation. One of the primary links, 'https://ttraff.cc/pify?keyword=calidad+educativa+definicion+pdf', leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body text is heavily obfuscated and appears to be a lure related to 'Calidad educativa definicion pdf'.

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=calidad+educativa+definicion+pdf
    • http://files.dbked.com/uploads/1/3/1/1/131163832/1601530.pdf
    • http://files.robertleebaptistchurch.org/uploads/1/3/2/6/132695596/nabininomuteforixe.pdf
    • http://baxakuj.vanfiretrust.org/uploads/1/3/2/6/132681352/70cb938.pdf
    • http://ganivomab.demusproductions.org/uploads/1/3/2/7/132740435/6141037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/femizon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/71249732175.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1271/files/54881983173.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/41662246764.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/41428402581.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/51121345376.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/zejevonexeviburiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/rafutafosapuwubiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/tetotiviwezejipanifo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0099/files/jamb_admission_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/mepigexaduwoguzodod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1524/1891/files/livro_epidemiologia_gratis.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_off00006169.bin
54b2cf03be297fd91b99e8465660122600ca2db1d8bd59f62400a309e2ab6173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 4840 bytes
font_01_sfnt_off000071fc.bin
74c5c45b23382dbce19c83a0104a55fb005e58d16768affb532758d200b5b848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FC 10672 bytes

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