Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2e516091c67d85…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 02:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3472fdfa3ba2e208547df7655df659e0 SHA-1: ff5d3af9695376b75079b54b796779a0fa9a5fbc SHA-256: be2e516091c67d857573ee6a21236b03c60029bee16f4da6899e3ec71772c3ea
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.ru/pify?keyword=elegoo+mega+2560+the+most+complete+starter+kit+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests an attempt to distribute malicious content or manipulate search results.

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=elegoo+mega+2560+the+most+complete+starter+kit+pdf
    • http://files.heritageelementarypto.org/uploads/1/3/1/4/131406140/bibunomudigamilodo.pdf
    • http://files.fortsmithconcrete.com/uploads/1/3/2/7/132740547/8022016.pdf
    • http://files.vergetrio.com/uploads/1/3/0/7/130739603/4478905.pdf
    • http://files.sylviedesign.ca/uploads/1/3/1/4/131408170/ec23791e.pdf
    • http://files.5degreespsychotherapy.com/uploads/1/3/1/4/131454221/8b14fd1e06.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5876/files/65700190749.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/574869212.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/furogariwetugad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31670740491.pdf
    • https://cdn.shopify.com/s/files/1/0435/7845/8275/files/loladutazanirafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/mukotelixinugopodiwava.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/english_to_sesotho_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/pukemerapolukotiverelak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/84976341457.pdf
    • https://cdn.shopify.com/s/files/1/0430/9601/5002/files/topukiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/muzip.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/bamopepo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a05.bin
958718f42970a8dc1c9c98e8b89f6a203f14e14b1b1deaf07e60f678ebae2146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A05 5824 bytes
font_01_sfnt_off00006ddc.bin
9d47c16d77b578da6114b6b1222da4a93d366aeead0064e12747e6c2e55dca62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDC 15272 bytes
font_02_sfnt_off00009d53.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D53 4324 bytes

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