Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea215110d4f2d599…

MALICIOUS

PDF

55.1 KB Created: 2020-08-26 17:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf86fa968b08545165d3cb378a6578d SHA-1: 026633cd99b49b0cac20f4ccabea8570d33064da SHA-256: ea215110d4f2d599eb92e69c75a16a223e35863eb1aff628c7c47e419bfc6779
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the URL for the malicious redirector and references to exercises, suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=ejercicios+operaciones+con+limites
    • http://files.jaromirnosal.net/uploads/1/3/1/6/131637325/2312f06b037.pdf
    • http://zetaz.johncallam.com/uploads/1/3/1/4/131483492/eeae2f6b3.pdf
    • http://weferujo.forwardintime.com/uploads/1/3/1/8/131856214/mejovuxuz_madobixogem_dimilopataz_jibilanakexi.pdf
    • http://files.medfieldheightspto.com/uploads/1/3/1/0/131070190/joridesaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/siniguzetaropebasivela.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zawitowawipujeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/61018662199.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/mupisorenajofaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/23681728722.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/fozojibabewodovimekas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/catv_system_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/8050439347.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/neuroblastoma_review_article.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.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_off000074c4.bin
b57c6c1c1d4be5c3ae3fc3fd95fa14ac0f8e0418fdef55974558b48a63a7e53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 5112 bytes
font_01_sfnt_off00008613.bin
b02101dee1ebea5b6aa64d5742e78c968134022f13af426ac4d20bc589db864c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8613 16072 bytes
font_02_sfnt_off0000b6f6.bin
7490f0512d425b7b68928d2de0767653bc465ede606eecca0ea44e7d2319ae3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 16264 bytes

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