Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc52779fc162e01…

MALICIOUS

PDF

48.5 KB Created: 2020-10-14 19:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 8e7f372cccab2e882720a07b08285c4a SHA-1: dcf41b95630f1a0bb8ad2ff2dfa4978f639c4324 SHA-256: 3cc52779fc162e01babd3938d8308f3a49ad90bb60fa51941c0852819bf4fbf0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body text, though heavily obfuscated, includes the same URL and a benign-looking PDF filename, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=currys+essentials+dishwasher+cdw45w16+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f87157227cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f87039b32c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f86f89f593a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8725de2583f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f86f55811991.pdfIn PDF document text
    • https://site-1038864.mozfiles.com/files/1038864/57173483590.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/60223153804.pdfIn PDF document text
    • https://site-1039414.mozfiles.com/files/1039414/semarasudemefekeje.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/duwivif.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/menojeluv_fitejezifug.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/1/0479/6625/7308/files/calories_in_1_crunchy_taco_bell_taco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6088/7193/files/riseresuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7602/1145/files/amsec_wes2113_wall_safe_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2549/8780/files/metropcs_authorized_dealer_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/table_saw_riving_knife_alignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7add750d-da4c-49d5-b310-4279c4d6b6ec/gaduzukixila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81558241-962b-45b9-9e4b-ed683f0ed62d/nisume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c1cb0f-4ed3-4fed-8630-64fa88c58d0b/mapinonunubizukowiwanale.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEC 5588 bytes
SHA-256: 0151d7003ebb0cb780a6f4832e72a063794e87ed98977dfee92df078004f53a6
font_01_sfnt_off000082ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82ED 10352 bytes
SHA-256: 540cd31deeebb81a5960c5306d19cee95ab3d02013c99df9f1c61f15a7ae4287
font_02_sfnt_off0000a65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA65C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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