Malicious PDF — malware analysis report

Static analysis result for SHA-256 669540f72d594998…

MALICIOUS

PDF

33.5 KB Created: 2020-08-06 19:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e0537f6bb21936f6b397348c32422b SHA-1: 475bf9119225ae69985128b055f970514adb2bde SHA-256: 669540f72d5949983f5ed2bd16fafd83d64693b6201a54f2f84e0200c6a2f7fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=crop+rotation+pdf+download', is flagged as a known malicious redirector. This suggests the document's purpose is to lure users through search engines to this redirector, which then likely serves malicious content or phishing attempts.

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/pify?keyword=crop+rotation+pdf+download
    • http://files.theharbourcc.ca/uploads/1/3/1/3/131398182/susowasiw.pdf
    • http://files.gracebible-rolla.com/uploads/1/3/2/6/132695492/mepog-mudut-mefev.pdf
    • http://files.matthewkalliman.com/uploads/1/3/1/8/131871416/3005130.pdf
    • http://files.rmgraphx.com/uploads/1/3/0/8/130874205/3ed2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1419/2285/files/zuzovilodivurenefegaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/ballard_scoring.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/preparation_of_benedict_s_solution.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/gidonline-_kino._ru.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/netozijavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/57735407311.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/simple_compound_complex_sentences_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/bioterrorism_act_of_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/76724308534.pdf
    • https://cdn.shopify.com/s/files/1/0446/3814/2627/files/teori_belajar_behavioristik_menurut_para_ahli.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/45284124678.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_off0000473c.bin
84dd045925a77b2aaf850b8bfb0cb1e55595259b92ff608fb861b63669837a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x473C 4856 bytes
font_01_sfnt_off000057df.bin
6563e5dd9613fe1e36305dfe58a0c799780b1e2d0268c3346584245c01fd984a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DF 9788 bytes

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