Malicious PDF — malware analysis report

Static analysis result for SHA-256 2750578467a7aea7…

MALICIOUS

PDF

60.0 KB Created: 2020-09-30 00:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 524818a58539a03285212fd4be267b19 SHA-1: 57f975b35b2e2993f2f45f434e482e8ebdceac9f SHA-256: 2750578467a7aea771541642b7a160e638c7a4929cf3a4487cb91cae257c6e67
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of these links, https://ggtraff.ru/strik?keyword=aristoteles+pdf+etica, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to malicious infrastructure.

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://ggtraff.ru/strik?keyword=aristoteles+pdf+etica In PDF document text
    • http://poniwomu.littletonpreschool.com/uploads/1/3/1/4/131438563/bewamezodoxum.pdfIn PDF document text
    • http://files.sincerelyemma.com/uploads/1/3/0/9/130969598/visakekavuzok_loneros_nirefufuxenoku.pdfIn PDF document text
    • http://pevetaze.gdsaucf.com/uploads/1/3/1/3/131383330/jifadimefob.pdfIn PDF document text
    • http://tifele.peaceablemarket.com/uploads/1/3/1/4/131438216/311242.pdfIn PDF document text
    • http://pavine.souheganvalleyquiltguild.com/uploads/1/3/1/4/131454046/veweniwotake-mumapa.pdfIn PDF document text
    • http://files.stayathomebum.org/uploads/1/3/0/7/130739871/b26634ec.pdfIn PDF document text
    • http://golinamaz.danaparalegal.com/uploads/1/3/1/1/131163992/zaxab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2383/4024/files/dino_hunter_hacked_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5841/2185/files/ood_interview_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3280/3488/files/bible_verses_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6420/8793/files/1_sample_t_test_minitab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f767d6-72bb-468f-aef3-bd1fb42ed9a1/68209782353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50c2d19-3055-4038-a29a-ba2e33a2b851/zanutozamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6472ea-e53f-4c33-93e9-b0913ff56188/rolewibugabomifi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA255 4820 bytes
SHA-256: f914d425d05cfccec1c02c9b5e269293657a006e418c983725c4bd29cea7897e
font_01_sfnt_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 9980 bytes
SHA-256: 1eff52617cf8cb24d1b652a75be11d7b32207bdf2b01b64083b4bfa2e7bd15c5
font_02_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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