Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cb6f8ca4c63447…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 12:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ddc826721be4330e53bd5cd32a02aa SHA-1: e242d7aa8a58737fd3068e92b83d606e496b45f1 SHA-256: 51cb6f8ca4c6344720de2942a6645f40dc85ed9e0cac75f06f1649f8585fc96e
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=descargar+promodel+2018+full'. This URL is presented within the document body, suggesting a social engineering attempt to trick the user into downloading software. The presence of a large number of external PDF links, many hosted on Shopify, further supports the SEO poisoning or link farm tactic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=descargar+promodel+2018+full
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/gugavim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/64371208084.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/28523798152.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/wordpress_template_full_screen_background.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/1699148995.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/el_bautismo_del_espiritu_santo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/xogalobaderigemaretoliba.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/jikifisogakoxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/haripath_baba_maharaj_satarkar_mp3_f.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/amazing_bible_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0460/7098/8964/files/ainun_dan_habibie.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_off00005cca.bin
7e387fd7885222c34ab5f4705e99d7c8def3415737f512b5e58e5a9183a4cdf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCA 5996 bytes
font_01_sfnt_off0000712a.bin
4d7e8d0530a661624c14a61e63551838b5ca2e0b89f3cff527cb05c92aab6d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 10584 bytes

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