Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a0ad70fbe57d93…

MALICIOUS

PDF

57.0 KB Created: 2020-10-30 22:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 66c914c426f6cd4f62edccdb7bcac53c SHA-1: 5bebbbc369742c9ce07486a1063f1878445036e8 SHA-256: c1a0ad70fbe57d938c6aa1457296ae743456ac330707246df15fda6197d54337
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?keyword=enable+r9k+twitch'. The document body also contains this URL, suggesting an attempt to lure the user to this malicious site. 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/aws?keyword=enable+r9k+twitch In PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/tokejuxapapepebilowi.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/9667116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f885c6919854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5f8e5cf39e729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f8897a72ce78.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/dovinavimozifig.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/kokiripisekaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f9b1f3b955bc.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/baludu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7692/0495/files/salario_minimo_colombia_2000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6e0ea3-25bd-4357-993c-2444b4029763/what_does_the_cytoskeleton_do_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb35842-e2a4-456d-811c-a6b2d1cc7e26/79635186046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e78e511-29c8-49b5-83ea-55221b2a36e3/jazilewolorixesenipewoxap.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 2972 bytes
SHA-256: 15eadf446dc272ce57e8fd3338e9cf193f324a4da69f120b9cd2cd04110db9fa
font_01_sfnt_off00007700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7700 5116 bytes
SHA-256: 31aa1d6acbd174eef9f3efd4ddb18ab0b519586876ca0072ea26b505bbc0fe53
font_02_sfnt_off0000887e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887E 8904 bytes
SHA-256: 82356fcc6ee8a680594de54245e2fa06ad6821a8fe35e0a7b250cb3a09ce8aab
font_03_sfnt_off00009a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A32 10824 bytes
SHA-256: 790ba61846bfbea78a544f0a023c5e9d20e32927912d3e214d35dc6a519e1416
font_04_sfnt_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 16136 bytes
SHA-256: ff430b11a8d17d420935ba1df5c0023e02d7a8943065c92946ec535e67d4a50a

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