Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a3e7666b662f28…

MALICIOUS

PDF

74.9 KB Created: 2020-11-08 22:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1541cf0b3b97d38c6025cd679a76ed83 SHA-1: 3736ccbe82d403721cfb805fe192724d78b5defb SHA-256: f3a3e7666b662f28ec23dec252af998530f94f71552046c7a56dce0332aa1b22
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that lead to potentially malicious content. The primary malicious redirector identified is https://cctraff.ru/123?keyword=geometry+dash+unblocked+6969, which is linked to known malicious infrastructure. The document also contains a large number of links to other PDFs hosted on various platforms, suggesting an attempt to distribute malware or phish for information through a chain of redirects.

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://cctraff.ru/123?keyword=geometry+dash+unblocked+6969 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fa6212a29d29.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/miburukamobopegejiw.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/vuwivoweveboponeji.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/lazefez_jilavazaje.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/luxuzolajewebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5fa0b3178a075.pdfIn PDF document text
    • https://solubowobadiwu.weebly.com/uploads/1/3/4/6/134642134/pobaw-muvexolusowi-manakibivepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f90f1344be9d.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/suzixegazunow/zuvunud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89abd74-481b-493f-b350-6c1e23e2ce12/kasonimugen.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/fundamentals_of_rf_and_microwave_transistor_amplifiers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/i_have_seen_the_eternal_footman.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000844f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844F 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00009412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9412 5936 bytes
SHA-256: 37752dcacf49d485186b73caad230ccbbd134d339917a4095113b8635a62e558
font_02_sfnt_off0000a8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E1 5824 bytes
SHA-256: ab6e235b4e6e406e2ab6b2203c3161ddf3796e746d96a5862fc1f880bd8fa81b
font_03_sfnt_off0000bc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8B 13976 bytes
SHA-256: 62c36353c82df72cda55e2cc6e71215702e59f4c4ef7b4f4034fc00cb14072dc
font_04_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 20688 bytes
SHA-256: cf6efc19611fdd594905f45d9892eb02b2709ee1a57857c4e9c0c7e69581f79d
font_05_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 6512 bytes
SHA-256: 9a9d1aecb4285209ea28c5b893b5e6d951bd5ec5609bf00d6ea336fcc2b68f9b