Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f672f17df8be2…

MALICIOUS

PDF

40.2 KB Created: 2020-08-14 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 344e9037039fd151b20b3eb6063ab7d4 SHA-1: 3d56a3a567f5b6cffbddd2d3fb4da57580da6869 SHA-256: a73f672f17df8be2f4a817643822799ad284d6d95fba044198effe1c73abdeea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'background music for videos free' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm used to obscure the ultimate destination or to appear as legitimate content.

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=background+music+for+videos+free In PDF document text
    • http://files.jaylagemann.com/uploads/1/3/1/4/131408142/gezemelusexeweraxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4457/7185/files/groupby_in_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/furilesolakutiluji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/46630198212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/15009883563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1710/7616/files/20125550593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/ravefagasorewininija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/lonely_planet_japan_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/82726613303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/block_caving_geomechanics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/86783541619.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6022 5484 bytes
SHA-256: 17ce35c2a64623c2dd72566f58949b9a8413c0f94bb290ead31d77e605e572be
font_01_sfnt_off000072bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72BB 9808 bytes
SHA-256: 389b65c4f52824d35fef5014a7f5c88fca3c6fc02367e4a3112337f0f2f2c2a1

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