Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1c27b9878a4651…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 11:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7b126f310c32c6f0d7e7dab8bb8cc30 SHA-1: 79f1a425ea83bea1c7319d7eef9d20793316aba4 SHA-256: eb1c27b9878a4651e98cc5ce5f9a17c1a8c72782242e5a806195e30afc9a2922
152 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 Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link directs to 'ttraff.ru', a known malicious redirector, which is likely the primary malicious payload delivery mechanism. The document body itself is largely obfuscated but contains the initial lure URL.

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=diccionario+biblico+hebreo+espa%25C3%25B1ol+luis+alonso+schokel+pdf+gratis
    • http://files.mikesmassivemissives.com/uploads/1/3/1/0/131070452/7964779.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.northwoodshaman.com/uploads/1/3/1/6/131606546/dbae9.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/zuwebikererib.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/nijupusikuvuwowoxutum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/20236380264.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/kobavuteriporavib.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/google_zerg_rush.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8167/files/79209618563.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/71469220463.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/23843293127.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/catholic_encyclopedia_vol_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/mabuvaniw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/fezejexunobotolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/java_spring_framework_tutorial_for_beginners.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_off0000584f.bin
1c2e6e8dcf8a947119806f9b9bc3b89b201b8c370a6ad8e0c12397502805d8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x584F 5832 bytes
font_01_sfnt_off00006bdd.bin
5094fa880060281eea53ad075cf9520d52fd53bc43bc0ebd1940be36f39e56a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDD 11188 bytes