Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3328a810df7d76…

MALICIOUS

PDF

32.7 KB Created: 2020-08-20 10:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6f638a547c2cfaca1106cbc5a7a4ef SHA-1: 37feac6ce24a16934434c303d86dcd2da633d009 SHA-256: 4b3328a810df7d769741f7351ef2aa18b23239b3debc16ef0e58bc9a4750853c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as an FCE practice test answer key. The ML classifier strongly flagged this PDF as malicious. The document body and embedded URLs confirm the lure, directing users to potentially harmful content.

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=fce+practice+test+pdf+answer+key
    • http://files.sabasphotography.com/uploads/1/3/0/8/130873794/xuritudu.pdf
    • http://fabagif.harrypottervet.com/uploads/1/3/1/4/131482975/bda37e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/makalah_fetal_distress.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/install_exodus_on_kodi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/nituludunudusosege.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/1196392824.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/fiwinapuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/livasipa.pdf
    • https://cdn.shopify.com/s/files/1/0449/8427/1016/files/regopupafonoxeledamuki.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/55957011842.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/6137001131.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_off0000431b.bin
0ef8d973b303ea5b6c8692b4f5b62429129a7ac0a5b8c2a7aba1b5c6dc2b9f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x431B 5332 bytes
font_01_sfnt_off00005564.bin
88346396c842de87c1a8639fab9c91f1c9420e6c381f908b91e1395d3f85c735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5564 9660 bytes

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