Malicious PDF — malware analysis report

Static analysis result for SHA-256 6035cb6faa22eaa2…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 14:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58efde219216cc7b364fb0c25439b868 SHA-1: 30a0db54ce0cd80dd84b369b1f947845606d804e SHA-256: 6035cb6faa22eaa2804f8429935b5849596ca1a2d39a391de7e20be7f7a120ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or further malware delivery. No scripts were extracted, and the document body was heavily obfuscated.

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.com/pify?keyword=adn+polimerasa+pdf
    • http://files.alohavolleyball.com/uploads/1/3/0/8/130874588/1088443.pdf
    • http://lited.omshantiyogaspain.com/uploads/1/3/1/3/131384281/bf292a463.pdf
    • http://files.caricatureparties.com/uploads/1/3/0/8/130874480/xojatoloximane_zugokudabisaruw_jetizekov.pdf
    • http://files.princetonmeadow.com/uploads/1/3/1/1/131164039/2fcb9074a2ee9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/sibisibutovobunikimum.pdf
    • https://cdn.shopify.com/s/files/1/0434/2317/0710/files/control_big_sean_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/gakizidirowagururudavawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/91497602851.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/bozaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/uninstall_git_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/87549725663.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/40029963503.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/56443986731.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/wukojufow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/sizozajola.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/77210506056.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_off00006280.bin
e3a0940f13b6aad739e19341c06d79d5e506bc21302cd592a3340dd0916dcfc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 5176 bytes
font_01_sfnt_off00007400.bin
8483bc0db407e897ee182c333f744d0ea8bed0931f677dfcdc31065035caa9be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7400 10316 bytes