Malicious PDF — malware analysis report

Static analysis result for SHA-256 620934bf3139a23e…

MALICIOUS

PDF

37.0 KB Created: 2020-11-02 14:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c9a3745a5ed06b88b3ee2336532b36a0 SHA-1: 91d58ea2564d988429250d62ade692edfa746b3f SHA-256: 620934bf3139a23e3a0053bb1e5585dd72395b82140ea11c3188cc54a9840085
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to direct users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and one of the embedded URLs, 'https://ttraff.ru/123?keyword=craftsman+high+wheel+trimmer+manual', is known to be associated with malicious redirector infrastructure. No scripts were extracted from this sample.

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.ru/123?keyword=craftsman+high+wheel+trimmer+manual In PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/2cf5c46.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/jolod-lisaruf-xipugegekila.pdfIn PDF document text
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/gajimukitobub_vabuxekukelebit_kawopo_wapel.pdfIn PDF document text
    • https://mabogafopesusa.weebly.com/uploads/1/3/4/3/134307699/7496014.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/jawokenozemove.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/bajaxoxudaduw_suruvasixezor_janexekomu.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/nekajo-depan-sizamiwat-judaxijotupu.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/68a9fa71.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/0cb67ba0-cd90-443c-8bb0-b637c31e1cb7/50862127154.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/kodofox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0997ec28-6c10-48ff-8786-6edaa7e530a9/zirigetebav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be32c977-38cc-4426-aaaf-38d267fe65fb/dorelujigewab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dc8d17-60f4-4bb5-bef1-09f53ed67889/umut_filmi_full_indir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000533e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x533E 5180 bytes
SHA-256: c77d5d46e3066c1777de2d2f80a854f0009c1da6f2e297e6fdb4d8c227ee25f7
font_01_sfnt_off000064c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C3 10160 bytes
SHA-256: 83ef4e939b5a16c291eb30bcfd9fd92a6610811b2c79ccd7646dde922b213076

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