Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adc22c2cdb194a3…

MALICIOUS

PDF

71.0 KB Created: 2020-07-24 01:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22753c654b8c172e1a7ed52c335c0479 SHA-1: bcf2a3d30ab77d753231b7cc67e3ff15cf680081 SHA-256: 7adc22c2cdb194a31f3596c9a913d5f5943b0a48271dbf28796a6ffb90fd8287
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, suggests a lure related to academic materials, likely to entice clicks on the embedded links.

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/wb?keyword=statistics%20for%20business%20and%20economics%20solutions%20manual%20pdf
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • http://files.greatstarthuron.com/uploads/1/3/1/3/131398010/68fbf0ffffdaf42.pdf
    • http://files.holistically-happy.solutions/uploads/1/3/1/0/131070231/bowotogox_pakunidub.pdf
    • http://files.journeytobetter.net/uploads/1/3/1/8/131871701/6b5d42308.pdf
    • http://files.eunhongkang.com/uploads/1/3/1/6/131606563/7199495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/28785283314.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/98530589359.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/35265623237.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/43655169744.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/madugorivikefedulij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/kutudiluro.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/zagoxonozavopiromavajuxux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/6373580317.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/badebobekotiluwirukede.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/55336198037.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/kifukelamajudeponu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/susuzovitinosajiva.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_off0000ce83.bin
70b5377e3d04bd7bac6e63375455b48cf670313a1aa00c3b4c44aee6d4f2ac09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 5424 bytes
font_01_sfnt_off0000e0c0.bin
4d4b29737ca6df82f8467d72b0166c85adf24a3eef5c8f1d15b700f8ce4c7b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 14556 bytes

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