Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1adc41948f317cc…

MALICIOUS

PDF

37.8 KB Created: 2020-09-01 22:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed51246ccc2881837bbd8b514be19be5 SHA-1: f16c62fd212b862a7fd1d0b9dc1fc254d7780352 SHA-256: c1adc41948f317cc581f400894bea431a53897b9c0f7d09d67b5071b5af725a3
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it's a malicious redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.ru/wix?keyword=beachguide+kinmel+bay, which is likely used to lure victims. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the link farm and redirection attack pattern.

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.ru/wix?keyword=beachguide+kinmel+bay
    • https://static.usrfiles.com/ugd/912de2_b9a31d45fbb5492091cead9c8a511f19.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_248d5b57d49841a39d3066050b6594e1.pdf
    • https://static.usrfiles.com/ugd/1b8612_2336faff9d9e4c099b0016073e96517b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f309e07050e64ca5be621a630ff9834f.pdf
    • https://static.usrfiles.com/ugd/70a38d_f2d3981d34fc418581f28fb05817c23c.pdf
    • https://static.usrfiles.com/ugd/565485_cdbfbac0ffd74ffc9304504ad70dc3da.pdf
    • https://static.usrfiles.com/ugd/3dd68e_257a5d68f0904c3dbf6772fef4596ff9.pdf
    • https://static.usrfiles.com/ugd/fb5067_896e181cbffd47d08ff9c14471d8c2d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_48151c44e7f5418980e2c23affea03ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ac94d7694e49bdafb1d80a59324829.pdf
    • https://static.usrfiles.com/ugd/fbcb80_33715a5fbc2d44289116530ce04fdfcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b86c36ca60e9492c9ac620fe6bc4e91a.pdf
    • https://static.usrfiles.com/ugd/f103bb_839f0bac82f1415cbe176c493278280b.pdf
    • https://static.usrfiles.com/ugd/ad2ade_0d189b71b9014e5288c32f6a89675f3f.pdf
    • https://static.usrfiles.com/ugd/4117a9_685249256f2f4bd2b3a057e167c5c382.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004413.bin
b26205014af61c05ceff3d45c29b660bd90c74ad31897b7d5d7c5567f75bf486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4413 5436 bytes
font_01_sfnt_off00005674.bin
436ea6fe0acb5da96cf300eac996ebf55f1f39b81cf35f78a161310f062696a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5674 8988 bytes
font_02_sfnt_off00007533.bin
585033b6790375ba53bb793973a73fbe50adb591fe43975c7e94f0d3a7d341f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7533 16208 bytes

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