Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7136263d0248dd8…

MALICIOUS

PDF

52.5 KB Created: 2020-10-05 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e4e25d432da6b20589ff075851ab3666 SHA-1: e23c1b868a8d46504f51a9716e47ff8a4c69d744 SHA-256: c7136263d0248dd8da773690ab4477fd5ff0a93e30c12edf0001576c0a2db8d8
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and are designed to redirect users to potentially malicious content. The heuristic firings indicate this is a link farm intended to redirect users, likely for phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous malicious links is a strong indicator of 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://cctraff.ru/strik?keyword=guitar+arpeggios+tabs+pdf In PDF document text
    • http://files.teatimeboba.com/uploads/1/3/1/3/131380754/wasuge-fonavaxegatogo.pdfIn PDF document text
    • http://pasiz.burtlakecsa.com/uploads/1/3/0/7/130740356/jazadej.pdfIn PDF document text
    • http://gikagagip.15landsdowne.com/uploads/1/3/1/3/131380845/faguwuxenawanasobile.pdfIn PDF document text
    • http://files.hordlevoluntarycare.org/uploads/1/3/1/4/131438195/padajagow_posugigovagiweb_jigutabinuwe_fuzeganiw.pdfIn PDF document text
    • http://vosali.thenovelsofdavidhough.com/uploads/1/3/0/9/130969723/e22c5b534e9cea3.pdfIn PDF document text
    • http://kumakes.projectveteranaid.com/uploads/1/3/1/1/131164104/pososobobir.pdfIn PDF document text
    • http://volaxet.preservedlinks.com/uploads/1/3/0/7/130739835/661242.pdfIn PDF document text
    • http://rizukoxi.lowellmagenealogy.com/uploads/1/3/1/3/131379103/9626418.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/93cbeae8-10d2-45af-bbe5-549569194374/janixemibosexirasoxadijok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1707b3-65d8-49cc-92bc-0af93164dc01/degasuvelijoparuweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453418d6-daa7-47d7-a0a9-3eb8acec7ee5/76445534369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9cf8f3-76bc-4d2f-9f1f-344736178f2f/satixumafedajibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8464/7073/files/community_in_the_nation_merit_badge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4433/4487/files/cobra_8_channel_surveillance_dvr_reset.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8883/3440/files/tatas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9700/7284/files/los_5_lenguajes_del_amor_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/wofebifikukitiwukix.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_off00008ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF4 5348 bytes
SHA-256: c0b8c0e163a59609b3babccdfd449131a52ecb51060017e52bc8b2eb578f796a
font_01_sfnt_off0000a22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA22E 10240 bytes
SHA-256: 458369917a792ea8075cba158111a40e7205b8e9790d16f5575654627b2fdd58

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