Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c960e9aceb4a21…

MALICIOUS

PDF

50.4 KB Created: 2020-08-09 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7428187c96252d3b73ae7f00156040d SHA-1: 171e21721f6b1fd328a8eeee80a4bcd35739cab7 SHA-256: c5c960e9aceb4a2149701dc8dfe7feca83778c8959a5767d79a1b5da10ed13fd
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=carbetocina+pdf+2020', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=carbetocina+pdf+2020
    • http://files.dollarsaver.org/uploads/1/3/0/8/130813612/ea2f4864.pdf
    • http://files.elizabethhitzel.com/uploads/1/3/1/0/131070581/5ab16.pdf
    • http://pigilan.dollygiftbaskets.com/uploads/1/3/1/4/131453574/ravilesuzimeman.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/20561768022.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/biostatistics_in_public_health.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94608223162.pdf
    • https://cdn.shopify.com/s/files/1/0439/2416/0667/files/4390331449.pdf
    • https://cdn.shopify.com/s/files/1/0430/3562/3578/files/gosokoguwosot.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/quimica_peter_atkins.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/advantages_of_relational_database_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/25415368031.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/60033818601.pdf
    • https://cdn.shopify.com/s/files/1/0448/1089/5520/files/athlean_x_biceps_black_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/download_buku_akuntansi_sektor_publik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/sosakosusazexubofotad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000788c.bin
093c633425cf33f1fab509faba1260e9592bb72528c019210d0f108976d834a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x788C 5260 bytes
font_01_sfnt_off00008a74.bin
02466290d0f8c50e6af5ee2d4be9ad7075b49ee43f90ce9a2bd99ebef24a3cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A74 15500 bytes