Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b5640692829706…

MALICIOUS

PDF

37.4 KB Created: 2020-10-16 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fdbaff0bc3a92566788b3445c3619b29 SHA-1: 9eedb0d60ee3af243137cc64e3ef72164551a32d SHA-256: 59b5640692829706bc53e74ac607d5ecb51789be8315657b7f4c16a879753e88
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary URL, 'https://gettraff.ru/123?keyword=gcse+chemistry+periodic+table+pdf', suggests a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for SEO poisoning and redirecting users to malicious sites.

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://gettraff.ru/123?keyword=gcse+chemistry+periodic+table+pdf In PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/8816e1b3d.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/1286989.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/5988349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f874fff0ce90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f88c4fb272f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f88ca549e374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f86f46d25d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f876ecd45598.pdfIn PDF document text
    • https://site-1043686.mozfiles.com/files/1043686/rufepojawunusamofanod.pdfIn PDF document text
    • https://site-1042432.mozfiles.com/files/1042432/79623682073.pdfIn PDF document text
    • https://site-1037267.mozfiles.com/files/1037267/38233401919.pdfIn PDF document text
    • https://site-1038831.mozfiles.com/files/1038831/fuzupiga.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/12763514981.pdfIn PDF document text
    • https://site-1043117.mozfiles.com/files/1043117/vitagamejekitesepejelij.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/pavodativonaguminikejewi.pdfIn PDF document text
    • https://site-1044297.mozfiles.com/files/1044297/vupusegogovi.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/wubiwelavitewumasoluz.pdfIn PDF document text
    • https://site-1039656.mozfiles.com/files/1039656/36789159531.pdfIn PDF document text
    • https://site-1039958.mozfiles.com/files/1039958/36315188897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/wagudevixeponininor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8861/0215/files/mapipina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/la_causerie_francaise_kansas_city_mo.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_off000052fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52FA 5668 bytes
SHA-256: b0cf9848027f0bdc73e953ff683e4c301ec47d933e8cfb7e075dfa2ad1594b2b
font_01_sfnt_off00006618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6618 10024 bytes
SHA-256: 0a3f5887314df14f806a4b595f6f901c8bbc73d9cee621e43aa5c94056e5b9fa