Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d4e4a3b360330d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-18 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc55e435601bcb52a345bc6039840d3 SHA-1: 5ad54f30a7f864a380350511eec1379d5d91250a SHA-256: 65d4e4a3b360330d9ce47dc3aae1305efa51d7a772a3b46351a4c7a01a9565aa
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure (ttraff.cc). Another heuristic indicates a large number of external PDF links, suggesting a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the ML classification point to a phishing or malware distribution attempt.

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=django+charfield+format
    • http://files.sonoma-chanson.net/uploads/1/3/0/7/130775980/jumuroberiku_vowunejud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/principios_de_la_arquitectura_sustentable.pdf
    • https://cdn.shopify.com/s/files/1/0432/3495/1331/files/falling_leaves_adeline_yen_mah_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
    • https://cdn.shopify.com/s/files/1/0436/0493/4814/files/8255958976.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/2010_volkswagen_beetle_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/83287489628.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/sound_booster_windows.pdf
    • https://cdn.shopify.com/s/files/1/0428/2033/7831/files/jifozukotuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/70798552841.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_off000078a7.bin
73d60f6c91548878ce508e2721ec909a98bc59a31b9d90fe46007290ac02329f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 5120 bytes
font_01_sfnt_off000089e3.bin
2d48876b6be5e84c464f4b72132a9063f8605897031dbee0cd933453881babc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E3 15280 bytes
font_02_sfnt_off0000b9f8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 4324 bytes

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