Malicious PDF — malware analysis report

Static analysis result for SHA-256 4878171ce2b4e829…

MALICIOUS

PDF

58.5 KB Created: 2020-08-28 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32af6528086839f51e75c4c3ba9f1897 SHA-1: 4f4ace95120134f5ecd821f09fab5953befc9c88 SHA-256: 4878171ce2b4e82911ad0b6be2bae97b7d0182ccb5f813a26dba4b44d64fdc75
152 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, indicating a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'Remington model 34 serial number'. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=remington+model+34+serial+number
    • https://cdn.shopify.com/s/files/1/0436/5221/9030/files/hornos_y_calderas_industriales.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/kawar.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/anime_girl_memes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/zegibuliritulowomoneta.pdf
    • https://cdn.shopify.com/s/files/1/0431/0695/9514/files/80397051009.pdf
    • https://static.usrfiles.com/ugd/b8c837_c45b466862d24e3e9a3067ae7ffe2457.pdf
    • https://static.usrfiles.com/ugd/b8c837_38493757649841c7a5b34681288a6b9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2832e418af6d455aae9d5866b4f4d745.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/marufilunibegib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/86506125320.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/65443899661.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/72790240354.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b4014c6baa24e85b730d37e90d6527e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6e7560c76046b39e6c2e43fc9f667f.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b032325d904897bf9cf1e87d7ac8a1.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079cb.bin
4d7c23a8bbd956846412cad21092a256a435ae68cd98e8afc5f34038109575fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 5424 bytes
font_01_sfnt_off00008c24.bin
89ad78b490b810577cde549124b147bf1cebe18577b59aa1ab4f50ef34c728e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C24 13876 bytes
font_02_sfnt_off0000b879.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16060 bytes
font_03_sfnt_off0000cd0b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 4324 bytes

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