Malicious PDF — malware analysis report

Static analysis result for SHA-256 30afe2fcfa30de01…

MALICIOUS

PDF

41.7 KB Created: 2020-08-13 03:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6762ef48d2ad8255064ba660e160175 SHA-1: 4e2b3a5a32e2de4f271abe5f87ee5d9099e93d27 SHA-256: 30afe2fcfa30de01c80f48c59f227b74ad824cd0fc5df03e5a35dc77921d2cfb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL, https://ttraff.ru/wb?keyword=experimental%20research%20in%20education%20pdf, is directly linked to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to potentially malicious domains. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=experimental%20research%20in%20education%20pdf
    • http://naziwe.abbyvolcansek.com/uploads/1/3/2/7/132740214/3925269.pdf
    • http://kanomazi.111pta.org/uploads/1/3/0/9/130969754/3470967.pdf
    • http://jugelol.berrycommunitychurch.org/uploads/1/3/1/4/131438641/kekigojetudupuku.pdf
    • http://turanu.portcitypottery.com/uploads/1/3/0/7/130738970/rofobavujodap.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/93839074851.pdf
    • https://cdn.shopify.com/s/files/1/0428/4376/6950/files/81137984234.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/57775062491.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2265/files/96529157927.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/xowezozisejipolidig.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/2465658942.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/letojodixipezasireviposaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/fukovoziwowix.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/rezugumafonumanidoxav.pdf
    • https://cdn.shopify.com/s/files/1/0446/8817/9353/files/ansys_maxwell_3d_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/korenisaduwajulilosenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/67323670576.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6670/files/wokegelufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0074/files/ascaris_lumbricoides_ciclo_de_vida.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_off00006484.bin
9d34cf05fc5dc57dd9472845a6a1568f454e5ae851992f45ebad0a51bc7a48c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6484 5420 bytes
font_01_sfnt_off000076c0.bin
6bebe8116f52a7a27669b94637759c954fe4c762457f21265d6113afdeb6941e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 10316 bytes

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