Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c2cfd5ae39024e…

MALICIOUS

PDF

57.6 KB Created: 2020-08-30 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 106c07b31e97aba90cdc788fab96ac0f SHA-1: 08b1fb7edad8a1189e6170fb6892c2ddae607f0c SHA-256: 21c2cfd5ae39024e5afb4cefcffeb65338ca890d3ab15d3f2269c170cbe8d389
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link likely leads to a malicious site designed to exploit or further compromise the user. The PDF also exhibits characteristics of a link farm, suggesting a broad distribution attempt. The ML classifier strongly indicates 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/wix?keyword=neltharion%2527+s+lair+guide
    • https://cdn.shopify.com/s/files/1/0430/6750/6839/files/52037817085.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/anime_direct_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0464/0709/0331/files/adobe_reader_2018_offline.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2904/files/ipv4_address_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/lupumuzef.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/sample_accounts_assistant_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/s_10_transmissions.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://static.usrfiles.com/ugd/fe83c3_1794d84fee2247dc9e50ef17820c8124.pdf
    • https://static.usrfiles.com/ugd/b8c837_359d602c73aa4c8c9fb2095920338b1d.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_f214cd970d634ca69ff74da9b6ee250c.pdf
    • https://static.usrfiles.com/ugd/b5472a_1419ce037f6847e682e91984cc722902.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/bhojpuri_gana_dj_mein_karne_wala.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/bigiwojafowotemowujej.pdf
    • https://cdn.shopify.com/s/files/1/0469/9697/9864/files/jufolemivogowovodup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/85574626542.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/47369207283.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a54e.bin
c11b8296a46d0c8e4ea9d076626a9c7b9c587207b8474d6b8ad8838a69ddb588
pdf-font-stream PDF embedded font (sfnt) at offset 0xA54E 5092 bytes
font_01_sfnt_off0000b696.bin
e6ade980fd390d675c08bf79b6bf32c3ced1c25e2980accf8d6c82e148281619
pdf-font-stream PDF embedded font (sfnt) at offset 0xB696 10140 bytes