Malicious PDF — malware analysis report

Static analysis result for SHA-256 027564a678e7434c…

MALICIOUS

PDF

55.1 KB Created: 2020-08-12 02:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334a74a63bf548c065ccb99551daf46c SHA-1: 63016aadbd5f9e03e821a729a1e2f91a5beebb56 SHA-256: 027564a678e7434c59c0a48cd6cff7f81791a13633914977a57d73b3921e5957
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic, suggesting an attempt to lead the user to malicious 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.com/pify?keyword=allyn+and+bacon+guide+to+writing+pdf
    • http://files.cameronbain.com/uploads/1/3/0/9/130969390/bibojozufoba-munidako.pdf
    • http://files.sbtyouth.com/uploads/1/3/0/7/130739525/kakerokesepaparifum.pdf
    • http://files.ironwharf.net/uploads/1/3/1/4/131453354/7192375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/taller_de_coaching_ontologico.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/gantala_panchangam_2016_to_2017_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/25032464023.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8840/files/97239065160.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5871/files/cloud_limit_breaks.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/xuxuveri.pdf
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/57640533051.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/puwifuris.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/15650790817.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/jemerarovudopirosune.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_off00008a4b.bin
6ef7c6c1980aa88c3c29dde80e1600d27c1b6f8550f5b7a4ae43ed285e0c0eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 5352 bytes
font_01_sfnt_off00009c94.bin
fbb1f316e9517bc3b987bac16539477c5e3fc5b66c7eb0ce66ad85f1e4a67b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C94 10656 bytes
font_02_sfnt_off0000c101.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC101 4324 bytes

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