Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf56fe3484142e82…

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 07:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22bcccb3d5c28f175ce9a7b95d9ad533 SHA-1: 91c22708a81bc956485d268842733e54b3053409 SHA-256: bf56fe3484142e826013cf94462890197f4c6fa977b134ea4cfe18b95344b94f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=foods+high+in+saturated+fat+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting an attempt to trick users into visiting a malicious site. The ML classifier strongly flagged this PDF as malicious.

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=foods+high+in+saturated+fat+pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/rebesekopokozexad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/56565613010.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/vehicle_routing_problems_methods_and_applications_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/96514983970.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/table_of_contents_in_apa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/xepoxudigus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/escience_lab_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/esy_cd_creator.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/fakederozewawos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/baby_girl_pic_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2773/files/mizatalonozetekivimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/wow_classic_major_mana_potion.pdf
    • https://cdn.shopify.com/s/files/1/0431/0754/9338/files/manual_j_calculation_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/bomuked.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_off0000612a.bin
7be1637d21f2a9315e7e2b7266ea93a99200c73c3ee9932edd6af45b2fb17eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5228 bytes
font_01_sfnt_off000072f0.bin
5cb41b82898a575ba5b5a5700b256c90143df71b1b92e922b1c221f433f0b88b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F0 10064 bytes