Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7265f5547584483…

MALICIOUS

PDF

49.5 KB Created: 2020-08-29 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f709fad2b27f63abfe9769e6a6600fcd SHA-1: f387a65672aeb4ba7927a8f2a01a884b08f45220 SHA-256: b7265f554758448388de931ed57fa2f6c9bd4b829c976acc10580a296291c256
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This, combined with the PDF SEO link farm heuristic, indicates a likely attempt to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains the same malicious URL and a list of other URLs, likely part of a link farm.

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=hero%2527+s+choice+chest
    • https://static.usrfiles.com/ugd/b8c837_07a66f47cd6d43139eb519c32810930a.pdf
    • https://static.usrfiles.com/ugd/b8c837_86be33b931344efba0f429b74e7e9e4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f4b5d7e0f44f5d9e1bf8966aa89c57.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/horror_thriller_sound_effects_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80170273674.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/meri_chunar_udd_udd_jaye_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/bajaj_allianz_bike_policy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/70769349537.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6715/files/devofegipakiwuxebenezojo.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d956ce77f8b44fa80c665f0e1b82399.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a734cfefba04034afa32b3a9a67140d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ad4ce883e724c28ab0be85e305d562f.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_off0000858d.bin
55b5e40372787f665919fa7ccbbfb7f3dbd7d09c1acc496f2a87449297e4cf6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x858D 4640 bytes
font_01_sfnt_off00009552.bin
619f3f8a02163aa688f648aa39d07c3784d26c2e668cc65bf6610a2a2c524cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9552 10688 bytes