Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd50abd4ce5eb2…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 07:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80d34c11b5e6202c7b195704a854fb5c SHA-1: 58cafacc11a318523d0b7b4a507f9135a0127ade SHA-256: 12dd50abd4ce5eb21d2c5db344ba233ecb9b54f404f08f1f8a9b964b9e8254a9
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. The document body, though heavily obfuscated, suggests a lure related to "advantages and disadvantages of centralization and decentralization pdf". The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=advantages+and+disadvantages+of+centralization+and+decentralization+pdf
    • http://files.tlppoetry.com/uploads/1/3/1/3/131381376/faruguzazenup-nakerifokadifuf.pdf
    • http://files.hypopara-awarenessday.com/uploads/1/3/0/7/130739782/jenujevugebaxemit.pdf
    • http://files.aarstudiomasters.com/uploads/1/3/1/4/131483019/c9e12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/bevumisufatuwadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/67171730149.pdf
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/52176654359.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/fofis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/59175272355.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/biruxatuwosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/58287310889.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/58585561392.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/baworosaxapeteve.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_off00007406.bin
b0392589e5851c2688d4ba0229988976b02072333cc8e44c15a3c22f21de0f14
pdf-font-stream PDF embedded font (sfnt) at offset 0x7406 5208 bytes
font_01_sfnt_off000085da.bin
f3360fc775d14b36e71b2df6b22a26f9186a81dc720c3bde133c91145042b834
pdf-font-stream PDF embedded font (sfnt) at offset 0x85DA 10064 bytes