Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408af21052650e8…

MALICIOUS

PDF

77.9 KB Created: 2020-12-15 18:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79b9ff4e4e6eb9406b413b77aecdb3b6 SHA-1: edd303d147890fe847d89cc4427918e8f5f634c5 SHA-256: 8408af21052650e8841f94317b1d9e405e8f4d00c753b8b17d7255613813cbf9
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/'. The document body, though heavily obfuscated, contains metadata suggesting it is a user manual, which is a common lure for phishing attacks. The presence of a large number of external PDF links, including one to 'https://s3.amazonaws.com/nilititonawafim/luwumelawirijateworajula.pdf', further supports the idea of a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=safety+1st+hd+wifi+baby+monitor+user+manual In PDF document text
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/wewapejoposi-pumojom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5fd8847411fd4.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/27858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/luwumelawirijateworajula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cf7ab7-eee6-46d7-98e9-2bcb8074d8f5/rsoudre_un_systme_dquation_non_linaire_python.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/wakosizusomuvezaxamofeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603eef9d-8d23-4d86-80fe-43c8fa556143/rectificador_trifasico_de_onda_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe406c9-c6a0-40ae-9f65-fc314d9ca570/4l60e_to_4l80e_swap_4x4_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/pewuporojojokonifoxovizox.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/jebupugarege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63125366-d08f-4ba1-8c4d-6ed981e699de/72520916567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418e295c-c680-4729-8a45-48c118077fac/med_eitleri_rnekle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74a0be9-bb6b-481d-b4bb-e06dec2b2563/half_human_half_dragon_dd.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/babul_supriyo_songs_free.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5636 bytes
SHA-256: 30ecfe5730ed172ea42a2528b205a6da12e2e4442271688c000de50f22b8e65a
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10776 bytes
SHA-256: 1b62273df37d2bc7d4e5f8f0bdfd98dcf390a8cf9804e5c68bb0274fc187e2d9

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