Malicious PDF — malware analysis report

Static analysis result for SHA-256 515ceefe53d270e9…

MALICIOUS

PDF

45.3 KB Created: 2020-10-15 18:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 030412dca9f4a7918dfa32f9dbcfeee8 SHA-1: 50aff3a25808c3e971cd3ce1e2e0c401d76b9e33 SHA-256: 515ceefe53d270e9d47ff14de24386573e56f4b2cbce8ecb04d03afd0a6f7578
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector infrastructure, disguised as a job guide. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the document body and heuristics point to a phishing or scam attempt.

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 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.link/pify?keyword=tamilan+guide+private+jobs In PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/sidutazufigag.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/3909662.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/38fcd24fbbe8ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f875c083ecc1.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/45423791364.pdfIn PDF document text
    • https://site-1039778.mozfiles.com/files/1039778/notujemotuxu.pdfIn PDF document text
    • https://site-1039149.mozfiles.com/files/1039149/polynomial_division_worksheet_with_answers.pdfIn PDF document text
    • https://site-1043442.mozfiles.com/files/1043442/bajifatide.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/ecbfe70.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f873d8a108de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f881f799e6e3.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/eee7f97b-17f1-4f90-b045-7eefa375a0a7/25812771878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cbd04a-a1c4-4ed4-b80f-6c3c7c73a0f7/gudekesedeseki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a0a87e-6c9d-4754-8068-dde5d45ce673/vifomewekufitodobubutud.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_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 5504 bytes
SHA-256: f5502fb2a6f4f403951bf328fd0b7abbef9362cbfdbdb0fc0a4661491d9c4459
font_01_sfnt_off000076dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 15420 bytes
SHA-256: 170a4930468f0a4d69e76c8e24487a8895ad7163fc7dbd93c3f4fe7838eec665

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