Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b5196af746deac…

MALICIOUS

PDF

42.4 KB Created: 2020-08-07 22:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae52a033f0d69cf1a2269c6d87f51f11 SHA-1: 31bccc1a4cbda4615026b5385f23572405fb24df SHA-256: 40b5196af746deac8004d4f7edada05d5f3ac43df29489b7b9b72d9f61aa5107
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, with a critical heuristic identifying a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=when+to+use+binomial+cdf+vs+pdf', is directly linked to known malicious redirector infrastructure. The document body, though partially corrupted, contains this URL and other links, suggesting a lure to external content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=when+to+use+binomial+cdf+vs+pdf
    • http://files.susanresnickconsulting.com/uploads/1/3/1/8/131858540/75b62b26b102c.pdf
    • http://files.artsandsmartsinc.com/uploads/1/3/0/7/130775071/3781918.pdf
    • http://mikefe.nickconbere.com/uploads/1/3/2/7/132741555/gexuraxejitoxirir.pdf
    • http://lunabif.maukabuilders.com/uploads/1/3/2/7/132710703/fe2a571facf7.pdf
    • http://files.matthewlundyportfolio.com/uploads/1/3/0/8/130813054/39765ef036fa0b7.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/wokoxoxapuzujazutulurukab.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/abecedario_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/xesutu.pdf
    • https://cdn.shopify.com/s/files/1/0448/4156/6370/files/how_to_print_labels_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/39946780790.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/pusodomobelegupilijovivij.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5045/files/4079888165.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/semubaxovamafafek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/bokipaxew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/fejafavosimoro.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_off00006700.bin
8466ff1c0a09f56fcd76022cf20836ca52ceee03c91b2c8adb40a14c8dbb4b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 5512 bytes
font_01_sfnt_off000079a6.bin
11b485d39af970f5c4d6d60f6e0b68bf7d03ad3129bc04738523152a79b80e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A6 10188 bytes

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