Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9625cc1257145d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-24 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a06c402d5c08bbd4b09a986920a8bc1 SHA-1: b25a9321d9ae5a509eecdcde6022432f1edcaf91 SHA-256: 6d9625cc1257145d180dbb422712b1b62aa219e66a4fd81ec43a224ada9be6ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

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=android+emulator+use+pc+keyboard
    • http://jevupoji.stefanschwarzkopf.com/uploads/1/3/2/6/132682107/bipapunavulura.pdf
    • http://zufax.myrnapearman.com/uploads/1/3/0/7/130739592/kozepupar-ximaketirute-wajotolevata-kifilobobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/razunubuxulutobes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/67522479010.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/51446272904.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/16051434016.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/47968128898.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/bet_hiphop_awards_2016_performances.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/zomopigepoxewasezinuvapox.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/33103509679.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/gutepoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/advanced_uav_aerodynamics_flight_stability_and_control.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/17375661128.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_off00006325.bin
ae7f6d65d4a3c2f39ef00cc04b7e7a7f1eda4a6f1a332b9e69e6a849b9d15f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x6325 5512 bytes
font_01_sfnt_off000075c3.bin
94d5ddd8835e98ee1bed4489cb57037eb3721de20fa6f94ab64070b5fed0ae84
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 10520 bytes