Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fc889444343c34…

MALICIOUS

PDF

53.2 KB Created: 2020-08-04 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adebb4b446ec1a6cbfb65d071d17242c SHA-1: d90c7abb8b101e382d2eaa85533b38d214701f43 SHA-256: 83fc889444343c344b415372308081c51baed9854fdf5e94115ac3be48f729c9
162 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=manual+java+pdf+2020
    • http://memuze.vladvieru.com/uploads/1/3/1/3/131383775/6031803.pdf
    • http://files.laurenknipper.com/uploads/1/3/0/8/130813859/mazodiruxara.pdf
    • http://files.guernsey-haviland.com/uploads/1/3/1/6/131636978/1900252ed87641.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/56953496756.pdf
    • https://cdn.shopify.com/s/files/1/0440/1790/9910/files/microsoft_time_servers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/woxawafabujut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/71401863769.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/biochemistry_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/nys_dealer_mv_82.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/basatalewepeleniwaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/46046953752.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7725/files/lujokek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/gesafowis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.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_off00009152.bin
be453f222f658294197d8f2c7f8550a8a23dd9a06b0847da375f115547b3c6c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 5176 bytes
font_01_sfnt_off0000a322.bin
cf50e102c5f3c16922e6e90ae3d6c1e4a550e88fed56ae4cfa5fae2f2a2265aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA322 10740 bytes

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