Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7bd3549290cd15…

MALICIOUS

PDF

55.4 KB Created: 2020-09-06 05:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49bd148d0190f84225f79fccb3e6675 SHA-1: db7e13d2b24746eb3aca5a97c9f412759a61cba6 SHA-256: 1f7bd3549290cd157707982edbba7edf5f297d64c25809900d42b32e1d75a441
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=que+es+certificacion+de+calidad+pdf'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious destination. The ML classifier strongly flagged 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.club/wix?keyword=que+es+certificacion+de+calidad+pdf
    • https://static.usrfiles.com/ugd/33c377_61114ca840c4457093b07100483acb64.pdf
    • https://static.usrfiles.com/ugd/2486b5_a0726e5898e54b29b1c651be71d6fc49.pdf
    • https://static.usrfiles.com/ugd/436160_6b129415eb6f4ca6b216ea917e140952.pdf
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/69206852249.pdf
    • https://cdn.shopify.com/s/files/1/0434/2192/5537/files/59277123282.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/magic_photo_editor_background_pictures_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2156/files/27755589698.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/rod_building_double_foot_guides.pdf
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/26094324065.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/41695896265.pdf
    • https://static.usrfiles.com/ugd/027f51_9a6cf0d659a14d90915034e29e8e1a2c.pdf
    • https://static.usrfiles.com/ugd/d6b5da_6f71dfea616947a3a0912f86a4e1e4d1.pdf
    • https://static.usrfiles.com/ugd/66f7a0_01d26d9bf83c47a8836e580cbd0bd695.pdf
    • https://static.usrfiles.com/ugd/c722c2_71c22d497a8d42e6b41e1cc3ca81749f.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_off0000977b.bin
9bb6dc0eef2b1d2e4ec5adb75e99d0f08bdb29f40764225c564e9b586c706ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x977B 5212 bytes
font_01_sfnt_off0000a944.bin
6627ac37c9f8c9feae32eb9979fe335ac02f0e92612460cd663ee3cb9738fac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA944 11608 bytes