Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0c627441b0a2ea…

MALICIOUS

PDF

45.1 KB Created: 2020-09-04 23:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3317d4f7a30b2ba162401472c55c107b SHA-1: 009bee3b9e6c39f19ccd8134112f2f8beb290732 SHA-256: bb0c627441b0a2ea8dde1ee99173e76febdd5022c1eb606d5f40a9e56962f008
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'free staff evaluation form template' which redirects to a known malicious URL. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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.link/wix?keyword=free+staff+evaluation+form+template
    • https://static.usrfiles.com/ugd/ee6770_55f0a640e89946c5bf355f79f22053fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_22753cedaa424edbbe5fa513a506f6e2.pdf
    • https://static.usrfiles.com/ugd/275374_0d9640bf91984e519c845f17efa31384.pdf
    • https://static.usrfiles.com/ugd/bc79a4_a5d2dbf8b8644b5aafed6cdf55b1b98d.pdf
    • https://static.usrfiles.com/ugd/e3834b_e534b850974b4adbb987fe075dfa8106.pdf
    • https://static.usrfiles.com/ugd/b4a829_702cc51724384aceaccb0125237bc669.pdf
    • https://static.usrfiles.com/ugd/33a16d_013ad8625fe442d2a5dcb955eda269d2.pdf
    • https://static.usrfiles.com/ugd/0047a4_35eb02eaa3ab465cab4d39e09f75c96f.pdf
    • https://static.usrfiles.com/ugd/d902bb_833e49eb6c8e41388cdcc39932ef353f.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/male_chastity_forum.pdf
    • https://cdn.shopify.com/s/files/1/0437/9217/1165/files/mefajebajuriripefiketuzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5107/1126/files/apprendre_a_parler_le_francais.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/jakepuvasezig.pdf
    • https://static.usrfiles.com/ugd/d216cb_3bd9e1474bda4f8db579ad624250f09f.pdf
    • https://static.usrfiles.com/ugd/3de8a6_6287b6c05fda471dbf069da7f8d8fda2.pdf
    • https://static.usrfiles.com/ugd/33c377_fbc4c1c55bf341a9801137bfe9c52856.pdf
    • https://static.usrfiles.com/ugd/062c90_f17a43e3840f4f309ba47ee285eba529.pdf
    • https://static.usrfiles.com/ugd/185811_84f345b0c9814a02880a4d480cc9f734.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_off000074fd.bin
b9e5fc182f7c357c070d3f69b5bc6850986a6e2d91e400ef0440aa0ff44010d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 5064 bytes
font_01_sfnt_off00008629.bin
6cc30a279988565f7e935198216ed1989ccca8db058f1304b39b877eb2d46310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 9600 bytes

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