Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c67e7bdd8d06058…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 23:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63bb54082bf087d0ac6eecbbdada3051 SHA-1: dd977a3f705ad2df15eb6133c71a6cee42c7d413 SHA-256: 6c67e7bdd8d0605895f7a63b340f211ec69d3d4b05766cce4fe1de95a4a08511
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful 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=estadistica+descriptiva+segun+autores+pdf
    • http://files.advancingstem.com/uploads/1/3/2/7/132740204/4a86e7f.pdf
    • http://files.communityproblemsolvingday.com/uploads/1/3/2/8/132814071/nokigusoto.pdf
    • http://files.reloveanimals.org/uploads/1/3/1/4/131483009/3317023.pdf
    • http://files.lifestarbrokerage.com/uploads/1/3/1/8/131857115/91d64.pdf
    • http://files.ottawaherefords.ca/uploads/1/3/1/6/131637553/3705631.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/git_for_windows_portable.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/seganebowujomufafokumuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/16874461475.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/nupizijakujeduvedugesor.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/fevakubosojenepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/35404861593.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/telufagasebafejudujepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/jibomilomugepefijarerina.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/52697579989.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/movalugedetogoxevoxubotiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/skyrim_double_cursor_fix.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/51164957324.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065df.bin
a03b6a5b8e8748f2dcd61983eb5d17ce6e030ac3ce23adb1b813a97f36e14fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5192 bytes
font_01_sfnt_off0000779c.bin
d14091bb23d805edcc4e0de88cb0a634da9fb48e8715ad62ec70e3763b37f593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 10668 bytes
font_02_sfnt_off00009a84.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A84 4324 bytes

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