Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca5cedea4217e4e…

MALICIOUS

PDF

63.6 KB Created: 2020-08-22 02:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7884491609043b046d9e70347655e89 SHA-1: 1800280876ec35641d83e0159433f6f6844d2602 SHA-256: 5ca5cedea4217e4ef89d2db2c9d2fb2d5967986c42387ec85c660a234b937d7a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=catalogo+de+tornillos+y+tuercas+pdf+colombia
    • http://files.bridgewaterdairy.com/uploads/1/3/1/4/131438079/66540c5.pdf
    • http://files.pact-ottawa.org/uploads/1/3/1/8/131857983/jotina.pdf
    • http://files.theredbarnpizza.com/uploads/1/3/0/9/130969057/7144c9e.pdf
    • http://gedix.toledopresbyterian.com/uploads/1/3/1/4/131409236/7573600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/bavomafapemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/jimodipipirajivojubulome.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/check_mark_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/lirepejexoweferor.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/zaregovapumilunanilosav.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6760/files/62444758932.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/mesepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/gedibitetegewetexafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/insanity_workout_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3014/2363/files/77316898743.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/kudanumuzas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3518/files/58464227946.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/devusosanupefuzo.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_off0000a8ed.bin
04063bac794cce12369bd50b3f72530528c9aa596128ca2656845d85a354606a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8ED 5620 bytes
font_01_sfnt_off0000bbf6.bin
c79b52c72ce32933f9d3b5fe9844d868d88b401542c29b0637a0de8106dd350c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF6 11328 bytes
font_02_sfnt_off0000e0dc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 4324 bytes

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