Malicious PDF — malware analysis report

Static analysis result for SHA-256 647c0fcd3ce68ddb…

MALICIOUS

PDF

36.0 KB Created: 2020-08-05 11:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4b02541267bf7faa8bc2e9417a0ffa SHA-1: 68b1f0138d7071166df61b3a7f7dbfc3023f80bf SHA-256: 647c0fcd3ce68ddb15d1791e99bce1c44ae08cf4f18ed9eb2aac549ed217f2e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, suggesting the document's purpose is to drive traffic to external sites, potentially for SEO manipulation or to host 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/pify?keyword=chiaro+corso+di+italiano+a2+pdf
    • http://files.mollymarrinbasketball.com/uploads/1/3/0/9/130969440/solewizuzojorozar.pdf
    • http://files.nstcricelake.org/uploads/1/3/1/4/131437535/toriluxi.pdf
    • http://files.rellaworks.com/uploads/1/3/1/4/131408928/tolipuvafubo-zevemesabet-lexusunelaxago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9243/4343/files/pobemonodavaketolusaferi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/xikatajebadina.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/sodok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/discord_points_bot.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/wobenigaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/22555075649.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/71300313427.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/72426960205.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/pride_and_prejudice_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/83103825530.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_off00004dd1.bin
896c8d6d1566a40c2db3c9e22091be75bf723dbdb6e13a84a48d0030321c4e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD1 5280 bytes
font_01_sfnt_off00005fba.bin
1f76b677c4d7e16dbbbdedbf6ae1fb05426e2488a0e26e793adcec2358226a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 10740 bytes