Malicious PDF — malware analysis report

Static analysis result for SHA-256 909ddd1d513d6657…

MALICIOUS

PDF

49.2 KB Created: 2020-10-02 14:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 789e6cd3bb5f1908a3b7d2244995abd4 SHA-1: 13e02e23f43a88b717ec4e27f93b48c8aa85af26 SHA-256: 909ddd1d513d66579d594120fea6722b817ddcf1eb3318c01e88f4c22561d8dc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on numerous disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links further supports a malicious intent.

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://ttraff.club/pify?keyword=northern+european+plain+coordinates In PDF document text
    • http://files.robinmaydavismd.com/uploads/1/3/2/7/132741225/raxewu-padudetap.pdfIn PDF document text
    • http://jenur.walpoledancecenter.com/uploads/1/3/2/6/132681352/monusimufe.pdfIn PDF document text
    • http://files.cnymariancenter.com/uploads/1/3/0/8/130874192/347558.pdfIn PDF document text
    • http://files.lucykingdom.com/uploads/1/3/1/4/131437848/6972002.pdfIn PDF document text
    • http://gesuxax.gwentiscoed.cymru/uploads/1/3/0/8/130874633/383c0880.pdfIn PDF document text
    • http://nizobimo.agprotocol.co.uk/uploads/1/3/1/4/131413603/6782915.pdfIn PDF document text
    • http://files.crafteahearts.com/uploads/1/3/1/3/131383514/08a920b7.pdfIn PDF document text
    • http://tonuv.taylorrao.com/uploads/1/3/0/7/130776783/fec93a0.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/17588383114.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/67748421230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/316c91ae-fc35-4d31-b888-3423e192f49e/filipijodewokiladogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8116fbcd-58e8-4d58-81f6-d84b293b2f45/28846737257.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_off000083f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F6 5132 bytes
SHA-256: 189bad92e0f32f8bbedcd863997fa390ae2c1c6f7aaf4ac48e212f8473d56a79
font_01_sfnt_off00009561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9561 10208 bytes
SHA-256: f4afab20c819ad5afd0dfffc6858780841e843b906f7ff90368554812de10cd6

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