Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6de2abb51c1e45…

MALICIOUS

PDF

44.2 KB Created: 2020-08-20 05:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a3655caa9cd345b08023c61b344670 SHA-1: ff29855d98a600a28cda21573b314e969d20030f SHA-256: 5d6de2abb51c1e45fa7415497c1806982fa318e2525a69dcf1544631e69722e0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=doubling+and+halving+worksheets+grade+5'. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets. The presence of multiple PDF links suggests an attempt to create a link farm or distribute further malicious content.

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=doubling+and+halving+worksheets+grade+5
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.idrha1.com/uploads/1/3/2/6/132681545/mobuv_gevipumekab_kimavusokularim_rapesozawifilel.pdf
    • http://naropex.limestonecowboy.com/uploads/1/3/1/6/131636665/zubogopevarewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/41199560049.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/94652463019.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/an_inspector_calls_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/chinese_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0448/3920/7069/files/formatting_numbered_bullets_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/wogurefibovatolutapuzuruv.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/bissell_proheat_2x_pet_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/52543995801.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/29310772388.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/zevoma.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/aventuras_fifth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/descargar_cancionero_cristiano_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb5.bin
841e36d3b41737fc8654129512d9d1c4fff99a2d1e9407777881fd123d7269cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB5 5448 bytes
font_01_sfnt_off00007244.bin
203fb23088e8be8f624f999b81bc23e112b49f43ba9c3a740b085e97184c3b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7244 10420 bytes
font_02_sfnt_off000095d6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D6 4324 bytes

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