Malicious PDF — malware analysis report

Static analysis result for SHA-256 b721e5c06d5703b5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 19:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b048eba57452e750af076018c2fb3f SHA-1: 2c5bfca869f6c09bf04d31273333eb7034e9fb81 SHA-256: b721e5c06d5703b5d9b1665858090243a730545250deb20dff9723278de8158c
154 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, primarily through its inclusion of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that one of the embedded URLs, specifically https://ttraff.com/pify?keyword=bruce+lee+be+water+video, points to known malicious redirector infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic reveals a large number of external PDF links, with the first being https://cdn.shopify.com/s/files/1/0429/8548/8543/files/44435685026.pdf, suggesting an attempt to manipulate search engine results or distribute content through a large number of seemingly benign links that ultimately lead to malicious sites.

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.com/pify?keyword=bruce+lee+be+water+video
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/44435685026.pdf
    • https://cdn.shopify.com/s/files/1/0449/8325/5198/files/homemade_glue.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/caillou_theme_song_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/unblock_phone_numbers_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/6230/3637/files/jikunova.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/77833115090.pdf
    • https://cdn.shopify.com/s/files/1/0436/5929/6926/files/emergency_preparedness_response_course_post_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/gordis_epidemiologia_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/printing_business_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/sizafaxudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/simplify_rational_expressions_with_negative_exponents_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/63094087301.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_off00006ed9.bin
8633f0a856d993e68046f19cf34374686bf75f3714432625ff3237940a80a9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 5096 bytes
font_01_sfnt_off00008054.bin
bf6defb39404b0f9dd5aadb1d1240606aadc15f4bd4fa209c855dc321b6ae36f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 10024 bytes