Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3a15265b84a0e5…

MALICIOUS

PDF

73.3 KB Created: 2020-10-21 01:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2e6ca852bf597e310629c408c98949ca SHA-1: 97751a9eaa7cf3c7f10c2f096d444e1b2000d878 SHA-256: db3a15265b84a0e559323d1f9e5322072d9d7d1c9d86339ec71b5bb5d498726a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links designed to appear as a free download, but they redirect to a malicious URL (ttraff.cc). This indicates a phishing or scam attempt, likely using a spearphishing attachment as the initial vector. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=psicoterapia+breve+de+orienta%25C3%25A7%25C3%25A3o+psicanalitica+pdf In PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/1415818.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/d1ebfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8c9a8713610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8c0061d75af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f8b93038d1d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f8ee1627ec3c.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/jupefujefazina.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/mowuruzovem_rasij_lakupako_madikomojuzom.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/ranaloxopoxedil_givatodef.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/4d755064aa91582.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/2507513.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/sifufone-rexukunojowibuz-vusozawevu.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/jorotideminen.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/f6e13c0e3f039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/racconti_gialli_brevi_famosi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/12472801631.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/5407669148.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/betaina_de_coco.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/simuzifobinumejak.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/30397895180.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/62430000271.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/xobixosijonixidexufoj.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/38315084033.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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 5852 bytes
SHA-256: 94704b4f26f247757d20d4834f9e0a0734dc6141ca815cdad66e47fc897c145b
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 12640 bytes
SHA-256: b6571bd790003374cd8828f5e3248529d020315d0c58b3b7ad8cff4e5d1c57f4