Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5199fe08db198c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-20 23:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccb1cca7a8ba2f1ba0d7b5811de9b19 SHA-1: 643c7b09a59763b636f44a442086a6ee5143f9c3 SHA-256: 6d5199fe08db198c56052ae8575dbcce680ad9282094fea318c4cc262de3ce75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary indicators of 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=a.+b.+s.+a.+ka+full+form
    • http://files.getcartparts.com/uploads/1/3/1/4/131411542/1774ff7e9fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8280/8472/files/robert_sedgewick_algorithms_in_c_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/tuzija.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/68203107274.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/49586421730.pdf
    • https://cdn.shopify.com/s/files/1/0431/9772/6880/files/biblia_de_jerusalen_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/velenide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/mofebero.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/crossword_puzzles_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/dexosog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/factors_that_led_to_colonization_of_africa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2259/6768/files/xijisemumumufojileg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/anisocitosis_pediatria.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_off00006892.bin
209311af06b634119bfec63fe4763cf3ac28552149b600014ec753c432d0889e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 5136 bytes
font_01_sfnt_off000079f3.bin
817e6f8cbe7b4ed56bbb5933416aa4c1a3c73e20e540a51858f8896d6d5616fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F3 10728 bytes