Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15dcb14fa1c84a0…

MALICIOUS

PDF

39.0 KB Created: 2020-08-28 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dfde892c797f3a63b6975fd92e850c3 SHA-1: c7718c7236282316cdb2dc0c4665324b433adb8a SHA-256: b15dcb14fa1c84a0c043be88218f47fea917ebcb6839a84c80c639cff7ab51f2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, includes the same URL and a title suggesting free English learning materials, likely a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=%25C4%25B0ngilizce+%25C5%259Fark%25C4%25B1lar+%25C3%25BCcretsiz+indirme
    • http://files.norcalsetac.net/uploads/1/3/2/8/132814935/jevedamasetani.pdf
    • http://files.hensleyvoicestudio.com/uploads/1/3/1/8/131871850/dikijon.pdf
    • http://mokeju.eartharkbotswana.com/uploads/1/3/1/4/131483245/5513673.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/74948023261.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/blank_brochure_design_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/62961024878.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/99434638710.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/28252148775.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/87357969503.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/fusagugizakutivitirunobaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/28447678823.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/burabulujixexifomed.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/jeep_cherokee_2017_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/diabetic_smoothie_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/formulario_examen_preocupacional_afp_futuro.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_off00005514.bin
792477bf6afae7635b625842772d687974ee3966c4a9311120b6f342c26f7167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5514 5724 bytes
font_01_sfnt_off000067cb.bin
0b60f413aa353128dc6f5598f0ddaf87ddb90efeb7ef054c97c00559bd2d3261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 12168 bytes

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