Malicious PDF — malware analysis report

Static analysis result for SHA-256 761ebbc20ae2ba34…

MALICIOUS

PDF

59.2 KB Created: 2020-08-20 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb852f2a5ac98633b55475afae224494 SHA-1: a202c37009ad1b3f394acd321c6832ec887b2d28 SHA-256: 761ebbc20ae2ba34041b4d676283f5ddf222f90e0f8bf467c92de3b2aa76c30f
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, many hosted on Shopify. One embedded URL, https://ttraff.cc/pify?keyword=bailando+english+video+song, is identified as a known malicious redirector. This suggests the document's primary purpose is to act as a link farm to distribute traffic 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.cc/pify?keyword=bailando+english+video+song
    • http://files.mfouriephysio.co.za/uploads/1/3/1/4/131406843/8267619.pdf
    • http://files.just-abit-off.com/uploads/1/3/0/7/130775607/desomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/the_respect_principle_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/b_boying_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/bagododejav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9843/files/sistem_reproduksi_manusia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/riwurogepamunuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/56174760190.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0577/files/realidades_2_capitulo_1b_practice_workbook_answers.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_off0000a632.bin
4818d7197d62e3289e5dfc3cac92c93deb50c70eec7e7a3acb1debf5674da183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA632 5100 bytes
font_01_sfnt_off0000b78c.bin
ed2a193a28baf511725812148f0da630bb9f4309e92dfadf3f093c6cf71a122b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 12328 bytes

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