Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbeee30c2ea206c…

MALICIOUS

PDF

35.9 KB Created: 2020-10-09 02:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 070d199b6d9061b4e0bf91a1d03a7167 SHA-1: e27562b41db8b12f52ad95a44d5ceee66c4e84e9 SHA-256: 9cbeee30c2ea206cae9cecc6735613302badc790cca4ab3d61f277528d5bab6a
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, indicating a link farm or phishing attempt. One URL, https://cctraff.ru/strik?keyword=7.+3+idi+glow+plugs, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=7.+3+idi+glow+plugs In PDF document text
    • http://files.stephenweberdr.com/uploads/1/3/1/4/131437849/xetefatolopupo-kaviga-fanazokus-wojatotuzu.pdfIn PDF document text
    • http://files.stillmomentsbycarmen.com/uploads/1/3/1/4/131408103/xawiro_pubuwavabil.pdfIn PDF document text
    • http://files.forevernursing.org/uploads/1/3/2/6/132682790/perovixekukizisof.pdfIn PDF document text
    • http://files.tinydapperfox.com/uploads/1/3/1/3/131379769/44f4336f3f.pdfIn PDF document text
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdfIn PDF document text
    • http://zemako.aspiritualtale.com/uploads/1/3/1/3/131382274/pijalojunebe.pdfIn PDF document text
    • http://dosozogaz.goldaes.com/uploads/1/3/1/3/131378950/606088.pdfIn PDF document text
    • http://winomi.ponderosabasinwater.com/uploads/1/3/2/6/132695829/3095442.pdfIn PDF document text
    • http://files.bigislandpartyrentals.com/uploads/1/3/1/1/131163908/wokozowe-vafitidojoriki-sonabebaziwo-mijaxirolalubar.pdfIn PDF document text
    • http://gasawevak.trinitybengals.com/uploads/1/3/1/6/131607063/xemuxo.pdfIn PDF document text
    • http://dutobu.olympiaquestions.com/uploads/1/3/1/3/131398020/vixigadovo.pdfIn PDF document text
    • http://sokifi.aoifesodenglass.com/uploads/1/3/2/6/132695569/3783667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9928/6429/files/lamp_shade_fitter_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/vewujilenilitepevep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3078/4411/files/5665651490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6122/9208/files/lose_hope_in_humanity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9041/4230/files/jexobudule.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5070 5096 bytes
SHA-256: 85cef10ac7e4bf0be8bc9ba42a10093e74386d692dc396156231e646cc5309c0
font_01_sfnt_off000061fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FE 9652 bytes
SHA-256: 01c6af883aa10bf35e35a59c47bfc66e84d4d8b26b49e26b24be0702dd40d26f

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