Malicious PDF — malware analysis report

Static analysis result for SHA-256 610be4ef14336b44…

MALICIOUS

PDF

74.8 KB Created: 2020-07-30 12:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bdec8981fc2886b3c3a879c65e4bd0 SHA-1: 604390bd74cd9d34141987cf7efe75a9cfef203b SHA-256: 610be4ef14336b4400e5399dead1917e37d5e03c99b5de15c25ab4aba8cd9a47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=approximation+theory+and+methods+pdf', which is likely used to distribute further malware or phishing 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.ru/pify?keyword=approximation+theory+and+methods+pdf
    • http://files.andymanley.com/uploads/1/3/0/9/130969939/ranukexirugipesirow.pdf
    • http://files.ptutoysandmore.net/uploads/1/3/2/6/132681296/541e7c.pdf
    • http://files.kilsythcommunityfoodbank.com/uploads/1/3/0/7/130775429/kugiregorufudinizaka.pdf
    • http://files.caledoniaworks.com/uploads/1/3/1/8/131871912/e945fd66ede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/mazorageneterego.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/gededobizotilurewija.pdf
    • https://cdn.shopify.com/s/files/1/0437/0979/2407/files/57620208061.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/dapobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/nibajanefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/13858092564.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/nerizutupug.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/78963177783.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/dufibedij.pdf
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/39551103259.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31e.bin
69971d74456748c8737a17434c164047740b10968f6e952f596f5d581d8db1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 5196 bytes
font_01_sfnt_off0000d49d.bin
8c27e12a0bcd72238971cc3801e89fd519c71f7bd4b976724940b497de57c967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 15296 bytes
font_02_sfnt_off000105b9.bin
d49dc8128b279f5a08ab43790f61111c4898d999f077c05ef735985cc265d754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 16860 bytes

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