Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b93cdeb9626c014…

MALICIOUS

PDF

63.9 KB Created: 2020-08-31 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84c771de331ea4a9327146ef5c8befd SHA-1: 38bfdb1a3fdbcbfc1418d21682808e9f5cd471a9 SHA-256: 8b93cdeb9626c0146bd4ecd6dbd754ee0d019edf053b8c1cf345e7aa3b9266b9
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 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/wix?keyword=tim+mcgraw+discography+torrent
    • https://static.usrfiles.com/ugd/36f25b_195641fe63814583a56f32037ff30c21.pdf
    • https://static.usrfiles.com/ugd/286fb8_31687b4bda094b48b18ecf3d47bc7e53.pdf
    • https://static.usrfiles.com/ugd/de02f3_2e2acafcfb2f4168b875a9f7e5fe647c.pdf
    • https://static.usrfiles.com/ugd/b8c837_61a8fd9d557f4068bb5e783080b20db6.pdf
    • https://static.usrfiles.com/ugd/66c878_991da102b3ed4579bf8d5daec057a2f2.pdf
    • https://static.usrfiles.com/ugd/906e9f_957cffeb60924318bda02fd4f18d8a6e.pdf
    • https://static.usrfiles.com/ugd/1c90dc_462f9b4881c3421d8da562e9d2387cec.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/zukufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/lonutisubilipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/dedakuxotivaral.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6364/files/nipewugit.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_off0000aec0.bin
39cc5d662b506bcbf1a20208eaa2b6486de8b7538d61a74e7dde733289c64797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 5596 bytes
font_01_sfnt_off0000c1b9.bin
cfbd275a9263f12997c40a6df4d7ca7997d51bb24cac8b337abe4ac45b6e3965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B9 15800 bytes

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