Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ecb4a54905bcd…

MALICIOUS

PDF

66.3 KB Created: 2020-08-29 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccd7211e12292b2e8944b143b486447 SHA-1: 99514accd2245bb630f64278aae04969f8df0391 SHA-256: cf3ecb4a54905bcdb1ad75e17e9e1b3031e599163c304884b89a068a266febc0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=redis+4.x+cookbook+pdf+download'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but likely serve to mask the malicious redirector. The ML classifier strongly flags 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.me/wix?keyword=redis+4.x+cookbook+pdf+download
    • https://static.usrfiles.com/ugd/b8c837_93df851ba33a428ba21dde46959a3e73.pdf
    • https://static.usrfiles.com/ugd/b8c837_3872781a27ec40df8fe96473d4beda52.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a560164ed24750b3b965e884e7aac6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0400/1443/files/teoria_del_aprendizaje_social_y_desarrollo_de_la_personalidad.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/faxazuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5887/1963/files/game_of_thrones_complete_box_set.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/moritetavuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/big_ideas_simply_explained_mythology.pdf
    • https://cdn.shopify.com/s/files/1/0461/2154/9988/files/android_app_icon_pack.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/activity_diagram_for_hospital_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/sijanoselivina.pdf
    • https://cdn.shopify.com/s/files/1/0436/4376/4889/files/wulekawal.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5398/files/jirijefijijojawon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/63316264370.pdf
    • https://cdn.shopify.com/s/files/1/0457/6775/3894/files/2381865742.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_off0000bb1a.bin
9b3c9e0a81c5c1c2ec08cd02c65f51720b1a83518b4242548bd16d587c53e4f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1A 5544 bytes
font_01_sfnt_off0000ce33.bin
37508b198179d01e334699fc864976f4d8d14deb648bc774fb98d65f02fe873c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 14452 bytes