Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4c5c1bb4df5648…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2774eeb5ec03c5b5a0c95a78ed8a04dc SHA-1: b238df3614c2609c9d3a1f49f24c62ad8d3a2f28 SHA-256: 4d4c5c1bb4df5648558deb24759afeb285f3c796b02c6199c69a2edf4f4cd924
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector, ttraff.ru. Additionally, it hosts a large number of links to other PDFs on Shopify, suggesting it's part of an SEO link farm. The document body contains garbled text but includes the URL that triggered the redirector heuristic, indicating a potential lure or redirection mechanism.

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/wix?keyword=caesium+image+compressor+apk
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/add_nightbot_to_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/2126466970.pdf
    • https://cdn.shopify.com/s/files/1/0454/3342/1982/files/free_chrome_app_for_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/38146295870.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/97387020295.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/exercises_routines_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/business_management_full_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/medio_hipertonico.pdf
    • https://static.usrfiles.com/ugd/ae15ca_9a1a02f8638e473db6e1fbd8a3fbbc60.pdf
    • https://static.usrfiles.com/ugd/6290de_85689b3bfa064f7580ab5c713424636e.pdf
    • https://static.usrfiles.com/ugd/64d889_3ecaca6122e04a168fad227891c37036.pdf
    • https://static.usrfiles.com/ugd/0a052f_979684a6a54b46ef9b98fe2f8658f1fc.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/vujerapobu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/antagonistic_muscles_ks3_worksheet.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_off00006043.bin
211fe3aa9ed83bfe479305a28f38e3f9b8801f9630eb57f86a09fcb112bce8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5188 bytes
font_01_sfnt_off000071d8.bin
86bcc2435f075642375bc2e1a4cc4bd83bc5133b780dae0ba7873b1f9096568d
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D8 11060 bytes