Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba991e72d9f2716d…

MALICIOUS

PDF

46.0 KB Created: 2020-08-19 18:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed07cce72a285e05816e4165c349d7b SHA-1: 1037d9a575ba5f88d241bb72e67c99411765a087 SHA-256: ba991e72d9f2716d7bbcd5d4a65a083493b7a19e949c423ec529276690187d8c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=reverse+convertible+note+term+sheet'. Another critical heuristic flagged the PDF as a link farm, pointing to multiple external PDF files hosted on Shopify and other domains. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains references to financial terms and the URLs, suggesting a lure for phishing or malware distribution.

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=reverse+convertible+note+term+sheet
    • http://files.shortytravels.com/uploads/1/3/0/8/130814283/visexuwevilixej-dabonekelijul.pdf
    • http://files.ritecookware.com/uploads/1/3/0/9/130969834/zononulusod-naluki-kurunazam.pdf
    • http://vudab.bentleygrove.com/uploads/1/3/1/6/131606490/visugepo.pdf
    • http://files.un-re.com/uploads/1/3/0/7/130738805/gesamoro_gotir_bolupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/jilikezixusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9654/files/73305326714.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/handbook_of_child_psychology_social_emotional_and_personality_development.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/xesite.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/lixojajefudetirugigoxik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/veferovitepegiguvarixog.pdf
    • https://cdn.shopify.com/s/files/1/0451/3228/4057/files/aparato_reproductor_femenino_monografia.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/nitupimizofameruvenol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3232/0917/files/31580932798.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/vetidajosodoz.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_off00007585.bin
929b9404e3ae55d308b8ab7ab9b3cc3dc1d66c19542ea949c581131ff64b135d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 5036 bytes
font_01_sfnt_off00008681.bin
8f2aec76a62b9cf1b9d1c932d12fcfb79da49dd261968b33558c92e318ad4665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 10804 bytes

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