Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bd8e6bdcf26eed…

MALICIOUS

PDF

41.7 KB Created: 2020-08-10 05:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0abbf53a7e33acbb477627a538b473 SHA-1: 933bbdd60414f9be5f4f3712ebb594ffbca1d0c0 SHA-256: a7bd8e6bdcf26eedd3d4c81f886f120ed2ed874ee1843b26a84be33819417240
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 resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=isometric+drawing+examples+pdf'. The document body, though heavily obfuscated, appears to contain text related to isometric drawing examples and the wkhtmltopdf tool, 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.ru/pify?keyword=isometric+drawing+examples+pdf
    • http://files.ssejinja.org/uploads/1/3/0/7/130775922/936864c7d800.pdf
    • http://files.mudlakefarm.com/uploads/1/3/1/6/131636825/667748.pdf
    • http://files.changenetworkminnesota.com/uploads/1/3/2/3/132302718/rowadazomu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/61440348066.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/9095967297.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/60773932262.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/zilosudalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/6756962510.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/bodikiguwojal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/misetoziwonegawozabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/72599133801.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/87961353130.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/89442437606.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/curso_de_piscicultura.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/54609033961.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/predicate_adjective_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/650168911.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_off00006413.bin
8a82a43b0676546699b66a9b40e15bc48d43847a610ecac8fa69971b3a131a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 5572 bytes
font_01_sfnt_off00007708.bin
2467cac3d990be1272d89a6ab6225e3ac603820a30215bfd73127261ebb02ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7708 10244 bytes

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