Malicious PDF — malware analysis report

Static analysis result for SHA-256 0920234ba47afa4c…

MALICIOUS

PDF

58.5 KB Created: 2020-08-11 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e112212942c048aaf7d458fe8754e13b SHA-1: e5fc4fa6d500f30904a56c1aad9e8e8bb2a5a9a7 SHA-256: 0920234ba47afa4cf9f9954d860d4723b94910b7ead7bf3f9633d23e71483367
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to 'ttraff.com', indicating a redirection to malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further supports this by identifying a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malware through a large number of seemingly benign PDFs.

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/wb?keyword=send%20off%20speech%20in%20malayalam%20pdf
    • http://files.tellmemo.eu/uploads/1/3/0/7/130740143/zafelo.pdf
    • http://files.keepcalmandkickals.com/uploads/1/3/2/6/132681937/kutatujelolorasisax.pdf
    • http://files.janeconquest.com/uploads/1/3/1/8/131871816/goxumupelolaxir-jagusatenedop-vasim-vorijidiwavag.pdf
    • http://kemot.johnsonfamilypastures.com/uploads/1/3/2/6/132682076/8258242.pdf
    • http://files.milehightransport.com/uploads/1/3/1/3/131384636/6530557.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/network_cable_crimping_types.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7263/files/didojoxoresitabi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/21074531885.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/tipegasojibujunifamoxate.pdf
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/57137148848.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/5293804543.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/strength_of_materials_important_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/galunibem.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/lelatejejovezozevovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/16369152286.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/jerazonewujovaluzufivu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7e5.bin
49927ad045ab5503785828e0327919d5c61f3b32742aa4531e2ab8196865a2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E5 5504 bytes
font_01_sfnt_off0000ba7b.bin
138a769bb3e5b5dec7a8078b51b30cbc50c01254d5ec6762d5d7068767d87f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 10120 bytes

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