Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81385cba031358f…

MALICIOUS

PDF

61.9 KB Created: 2020-08-18 22:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e2314550ec93cc8f2cfdc9763d067b SHA-1: ab96630f0e32dd83768532dfff5d7a69a97eceef SHA-256: c81385cba031358f6d73b033dff4c2dc6ab9b00b45064c60aee51a98a3d40442
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.cc/pify?keyword=neonatal+polycythemia+treatment+guidelines', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Neonatal polycythemia treatment guidelines', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=neonatal+polycythemia+treatment+guidelines
    • http://gifejume.anviltraining.co.uk/uploads/1/3/1/4/131438873/7084671.pdf
    • http://files.jamesdykman.com/uploads/1/3/0/9/130969389/sawusugigatepo-tumosogeluxaz-solitunilisuxo.pdf
    • http://files.okichitaw.com/uploads/1/3/2/8/132815343/garadajozenaxu-vapexasosetos-nivesigogud-bunekirilebo.pdf
    • http://denenofiv.johnsguitarrescueandrepair.com/uploads/1/3/2/6/132681351/0f95bfeab957.pdf
    • http://files.wavelengthscounselling.ca/uploads/1/3/1/3/131380052/857b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/nomiko.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/human_anatomy_physiology_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/3336/1574/files/nosexipegowogukexodavebu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/acgih_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/animals_without_backbones_buchsbaum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/4352009586.pdf
    • https://cdn.shopify.com/s/files/1/0451/4296/6426/files/bharat_acharya_8085_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/diniladimazaraxosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/jalizuzapuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/dunaxetas.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/32401955677.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc9.bin
1168a01247521dfdf2b5928f5e0be01ea38581d0d896b2fbc5bb4d3fa0978dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 5556 bytes
font_01_sfnt_off0000c287.bin
c39e08d308ab4f25dea77488398c89b505da546427120b464ab74d607a41556f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 12172 bytes

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