Malicious PDF — malware analysis report

Static analysis result for SHA-256 98904ca9cf84145e…

MALICIOUS

PDF

34.0 KB Created: 2020-08-14 02:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9529b3989279e60a0b2b5b2fa7e85d2 SHA-1: c486c4c075c816f5f1b8e892f2382e1634e36a49 SHA-256: 98904ca9cf84145ea9abcb12513fe969e3b47d59bf657807dded2d21388cf1b0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially obfuscated, includes the same movie-related search term and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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=wrong+turn+movie++in+tamil+isaimini
    • http://files.windowviper.com/uploads/1/3/1/4/131455903/zuxoxubas.pdf
    • http://ritasuzo.milestoneco.net/uploads/1/3/1/0/131069934/8785346.pdf
    • http://fuvuvo.banahawhealsspa.com/uploads/1/3/2/6/132681579/9da25c09bed3.pdf
    • http://files.stephencollins-painter.com/uploads/1/3/1/0/131069934/mafijubuzomobam-talorezamu-xuxegosupomizun-jupinetujuwuli.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/putobuwiwajimatidape.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/41516973109.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/wiluvorozilagopotikako.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/18243208686.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/norikitexola.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/396337748.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/tudezovazeworenanalewes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/canales_de_marketing_y_distribucin_comercial_pelton.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/1809500906.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/kovalozixepod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/disadvantages_of_smoking_weed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/56059009391.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/51253697374.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_off00004889.bin
eba87b92ffd3b89250c9b756dbd0f6fae5eecd852c3a85c1445a8eb29d6dc941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4889 5076 bytes
font_01_sfnt_off000059c4.bin
b667501fb80183c307026635cddfbda0c7613b4c65baf1eb078948096863704c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C4 9744 bytes

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