Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a06479fe300b17…

MALICIOUS

PDF

40.2 KB Created: 2020-08-04 12:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89a29e1bf0b9c52ebe27cf85520da180 SHA-1: f8410d5ae220749508d1fb3d7f46599e37659a65 SHA-256: 73a06479fe300b17653ce9af69f606e260ec366d03c9ff95075fbb85c144ad42
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or distribution mechanism. One URL, https://ttraff.ru/pify?keyword=sentence+according+to+structure+pdf, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a likely attempt to direct users to malicious content or manipulate search engine results.

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=sentence+according+to+structure+pdf
    • http://files.thegauge.us/uploads/1/3/1/4/131408100/5087998.pdf
    • http://files.rlcraftvinylstore.com/uploads/1/3/1/4/131453990/5af30c11ec.pdf
    • http://files.lukasz-drozd.com/uploads/1/3/1/1/131163533/funuwolazatuvak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/31030585407.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/kikexisadaxafelo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/budebajuwutimekudik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/80031275682.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/discord_bot_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/foxofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/zovogotekutetavaga.pdf
    • https://cdn.shopify.com/s/files/1/0439/4326/4411/files/rusogujasipireniduk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/nukimipizibadawopixokepos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/62216585207.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/fodoxibipuziko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/fight_night_pc.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_off00005f56.bin
16c4ca472dfb0f930b66c3294f768ca47eba7be26c96f828027fbf45e09f138e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5396 bytes
font_01_sfnt_off000071c3.bin
734ff492588ca33b0651dde8ec52baff53e97f2d3d2ab88d3f2bdc85e7705532
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C3 10076 bytes