Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff1905cae628b19…

MALICIOUS

PDF

51.8 KB Created: 2020-08-19 15:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d440373cbcf929d6788160e0a1f58268 SHA-1: 1354a41824d669dd1c82b5f871ded78f49f8fc39 SHA-256: aff1905cae628b1985ae85067dec7a484cd26a07e9d021d7b1cfd8211a3e9e8b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting a link farm or SEO spam campaign. The ML classifier strongly supports the malicious verdict.

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=g%25C3%25B6tz+von+berlichingen+goethe+pdf
    • http://zobesa.muotojewellery.com/uploads/1/3/2/3/132303382/vosasabepisuk-ramunaxakaj-padupil-nezife.pdf
    • http://files.cwtchcandles.net/uploads/1/3/0/7/130775220/ketefoxeka_sebofuz_warafobazaba_vebegis.pdf
    • http://tijojoxur.smokyriversporthorses.com/uploads/1/3/1/3/131379759/53c65e52ac931.pdf
    • http://files.fittingroomligonier.com/uploads/1/3/0/7/130775232/wukozasozoxe_jumagosufa_lisud_sufajiwedi.pdf
    • http://sipoz.houstonantioch.org/uploads/1/3/0/9/130969483/molubawatuzide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/buwemerudoruwutoxib.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/405516413.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/92781934030.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4455/files/sifat_boraks.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/tuvabololivufag.pdf
    • https://cdn.shopify.com/s/files/1/0432/4989/3531/files/zebelilin.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/getonijufewek.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/religious_trust_deed_format_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/barodezodeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/8601149660.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/assembler_tutorial_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0437/8440/5153/files/weather_report_of_lekhapani_assam.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1715/files/que_es_el_marketing_relacional.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_off00008896.bin
35c778ea6721a57cef9e58ab7f9c80788746f74a8146228fb393513e7b575f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8896 5448 bytes
font_01_sfnt_off00009aeb.bin
10a0f66ab5e5260b12017ad973054600ce4893e0a00cc38e1130eb76909016d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEB 11352 bytes

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