Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7238c80e63483ec…

MALICIOUS

PDF

54.4 KB Created: 2020-08-09 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd40ca81f87f58e1628baf6692dae197 SHA-1: 289dd65d9540a26f2a11662bfd4b8ed2eea1fed1 SHA-256: a7238c80e63483ec9d28807d27562d370b0bcd2d8176810aeda91a3f402e2e30
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'biblical dictionary' and references the wkhtmltopdf tool, suggesting a lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, likely for SEO manipulation or to distribute further malicious content. 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.ru/pify?keyword=diccionario+biblico+strong+pdf
    • http://files.thatguyrocks.com/uploads/1/3/0/7/130740141/memediz-gekefilaxifokab-vavob-juvizuxi.pdf
    • http://files.graceinwellsville.com/uploads/1/3/0/8/130874205/damodegafoketo.pdf
    • http://munovuru.westplainsparksandrec.com/uploads/1/3/1/6/131606490/totolemalanezo.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.sjcnl.ca/uploads/1/3/1/4/131413148/1850115.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/suvuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/mib_full_movie_online_free_putlockers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/64764723202.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/fundamentals_of_transport_economics.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/convert_gif_to_png.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/julefufuzurepudebijesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/bitcoin_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/memiwopawuporajet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/biosynthesis_of_steroids.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/72699905627.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/41886018327.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_off00008b8b.bin
fad152732bd5dea337295f58fbd6704d1641d543f815e0e028200333de53a7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8B 5464 bytes
font_01_sfnt_off00009e2b.bin
9190dc882cccbcd40084a2c307f75fbcd592c5f77269eb778debb8148e6755da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2B 14856 bytes

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