Malicious PDF — malware analysis report

Static analysis result for SHA-256 64436d623cf0aabb…

MALICIOUS

PDF

45.2 KB Created: 2020-08-15 16:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edadebc29b6bd611010d920a13c7e3b1 SHA-1: fe60c77b988e00fea19e5c90dd5ae008b91d65eb SHA-256: 64436d623cf0aabb67daa883e9cc0f8bd14b757203b51c3f0a3e4a5249753bd9
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=ambledown+gap+claim+form', suggesting a phishing or scam attempt. The presence of a 'download button' heuristic further supports a malicious workflow, likely leading to a second-stage download.

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.cc/pify?keyword=ambledown+gap+claim+form
    • http://files.nforchestra.org/uploads/1/3/1/4/131453219/bodotiruluvuke.pdf
    • http://files.coloradobusinesshalloffame.org/uploads/1/3/1/4/131408502/2698966cb3.pdf
    • http://files.alwaysgetbetterstronger.com/uploads/1/3/1/4/131437295/fopurigiki_femad_vizep_nurikolatuvirok.pdf
    • http://nilofafof.dpoffice.org/uploads/1/3/1/3/131380042/4c78c84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/rogue_multiclass_5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/webejej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/kelovopimodawajojovudatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0649/1797/files/definition_of_work_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/kenmore_progressive_vacuum_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/fitokutur.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/devix.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/kabudefikitezofivojom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006488.bin
060f63bb24a961f4693900283ce22cb03deebaff0b1b2c414872cbaef946d3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6488 5228 bytes
font_01_sfnt_off0000763b.bin
7acbceb7e31bf1b9672cd5a2a1c7b1642c967a4dc5e9a26dc24e5260105bacca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 10488 bytes
font_02_sfnt_off00009a17.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A17 4324 bytes

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