Malicious PDF — malware analysis report

Static analysis result for SHA-256 5474562bb625d1a4…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 10:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c32d9495b4e82bce15314e09a00ce8 SHA-1: 739607d45f3b47d5ca6688f5c2959e51f1ac67a0 SHA-256: 5474562bb625d1a4f3238786212bbfd599915af3a0b65b2f064143963267726a
154 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.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same malicious URL, suggesting it is the primary lure. No scripts were extracted, but the presence of the malicious URL indicates a likely phishing or malware distribution 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=kahraman+tazeo%25C4%259Flu+iki+s%25C3%25B6z
    • https://static.usrfiles.com/ugd/b8c837_57857feb91ca481c9a83f02965e15cfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4a0729e245046edae04b76f9e289909.pdf
    • https://static.usrfiles.com/ugd/b8c837_62739d95b2f248fca9c21bdb07cb5f2f.pdf
    • https://static.usrfiles.com/ugd/7598fa_fefc1a334df64d999ae674f0ac258d3b.pdf
    • https://static.usrfiles.com/ugd/73c254_8a1d36b161fb4035891c604085da6136.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/pazeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/6307/4213/files/takirazalowesog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/482044533.pdf
    • https://cdn.shopify.com/s/files/1/0465/1696/1430/files/chapter_38_angiosperm_reproduction_and_biotechnology_answers.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ea7ea2e5b652463bad88554b2f066321.pdf
    • https://static.usrfiles.com/ugd/cafc24_8c1d8fec1ae6464c96736415662fb627.pdf
    • https://static.usrfiles.com/ugd/2c8d66_ead9c5ac7b9842979e42c37f01850362.pdf
    • https://static.usrfiles.com/ugd/b910ae_0fba6e6224654d42a3c28f18ac02ee24.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/administrao_de_produo_e_operaes_henrique_l._corra.pdf
    • https://cdn.shopify.com/s/files/1/0430/8579/1383/files/Gehuse_mit_Flssigkeitskhlung.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/json_to_php_array_converter.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_off000071a8.bin
7b2a0a7867babd2454db88965d021d46e132e13c81fc88916e59d68848ce9745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 5376 bytes
font_01_sfnt_off00008392.bin
d2b1e53e91f17972594c8ea44262c0dff94d6d78a9302dcc68ecd56bc156d60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8392 11672 bytes
font_02_sfnt_off0000a7fd.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FD 16164 bytes

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