Malicious PDF — malware analysis report

Static analysis result for SHA-256 13849f7ab0cadc90…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313c2ab61a452eff845725871a2404f8 SHA-1: 74b80f9e0907d64ff3ed34d70e18f8183b590227 SHA-256: 13849f7ab0cadc901c5a73e81b3fdc940b9cd5e3e219662038d314fc6cd4a21a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=network+security+tutorial+pdf', indicating a lure to a potentially malicious site. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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/pify?keyword=network+security+tutorial+pdf
    • http://files.jwnorthavid.net/uploads/1/3/0/7/130775635/0ef62327c653dbe.pdf
    • http://files.rachellwoodard.com/uploads/1/3/2/6/132682528/vokutolisame-kisetapotugup-xadutijumi.pdf
    • http://files.gempatentservices.com/uploads/1/3/1/4/131482931/vixofeku.pdf
    • http://files.nostringspuppetworks.com/uploads/1/3/1/3/131383483/pulifajazadevenomu.pdf
    • http://files.luminousgci.com/uploads/1/3/2/7/132740384/gorinonotux-senotekunawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/biguvife.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/sotuvavudokapibopoxoxige.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/57097989416.pdf
    • https://cdn.shopify.com/s/files/1/0439/2127/7096/files/matlab_tic_toc.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/lenexuwofavujowevilofike.pdf
    • https://cdn.shopify.com/s/files/1/0437/5537/2695/files/tawopolojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/29561144074.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/19007462397.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/11786811315.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/74262178272.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/86144974042.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/tuvasefojalepajaribot.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/63344216029.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/jomolizolonemef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006733.bin
0d53a56fa1752f162422880e036778eea06c54b96ae8fd29932dd1e2c49f007f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 5376 bytes
font_01_sfnt_off000079b0.bin
ffeae72567688a57e732464050c0eeedd0d49f0008fe595dcbfdc7cc6becfb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 10108 bytes

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