Malicious PDF — malware analysis report

Static analysis result for SHA-256 5548a9bf1f2fc738…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 15:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86da9b9f918d12843502f298db38da5 SHA-1: b716a2ba1b5eae6b1417bb20673a7a4a65c7608d SHA-256: 5548a9bf1f2fc738447c81d13f55a9472e7ad24d953fdd9ac1a47f916392c43f
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The redirector URL is 'https://ttraff.com/wix?keyword=princess+yummy+porn', which appears to be a lure for adult content. The document also contains a mass external PDF link farm, with the primary domain being 'static.usrfiles.com'. While the document body contains garbled text, the presence of the malicious redirector URL and the link farm strongly suggest a phishing or malicious content delivery attempt.

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/wix?keyword=princess+yummy+porn
    • https://static.usrfiles.com/ugd/b8c837_e464a8a67a07489fa31bc7d8cdac3a0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7963a5d28ff3418eb938050d1d49058c.pdf
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.pdf
    • https://static.usrfiles.com/ugd/63d3ad_838c303d3c95460db5c9bb419d969ba5.pdf
    • https://static.usrfiles.com/ugd/b8c837_22a61ac8063440f0b6ac9a509f4e206d.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/bosonufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6119/files/baby_shark_song_lyrics_and_actions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/credit_card_statement_template.pdf
    • https://static.usrfiles.com/ugd/6908d7_abde2e6fdaca430f9ee3d348bbdbefed.pdf
    • https://static.usrfiles.com/ugd/ab922d_28c2ec3ec5564d759aef1d09c8754019.pdf
    • https://static.usrfiles.com/ugd/ea78e0_6782783c755a40aab09b0c525598fc6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7dff08cdc934edf9583b34df90f6ec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_222deceaae0748d1927b6cf8a0228f86.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_off00004c7a.bin
b604591dd6bb54a79caf3ec9a53c8b9bfc3d98c58811f68b4416fa24a0b813e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7A 4940 bytes
font_01_sfnt_off00005d31.bin
1822a538a0ca183744623cb1456a5d1ee30cbe5468f67a1517872c8474ae0aca
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D31 12452 bytes