Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d61a9613f3ce36…

MALICIOUS

PDF

78.4 KB Created: 2020-10-07 14:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7612056c36535c3dae6fff3a2fcaa336 SHA-1: 7e4cccab72eb562c4621ad7192d55815fcec8a91 SHA-256: b4d61a9613f3ce3661672dca1241fdd8ea94a3be4880eca0adca6d21895c84c6
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting services and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ggtraff.ru/pify?keyword=disney+2020+trip`. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the Disney trip lure and the malicious URL.

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/pify?keyword=disney+2020+trip In PDF document text
    • https://site-1038744.mozfiles.com/files/1038744/merekabadazilazuxivofow.pdfIn PDF document text
    • https://site-1038675.mozfiles.com/files/1038675/mewokowu.pdfIn PDF document text
    • https://site-1040982.mozfiles.com/files/1040982/xidejizezagarizoxurukexa.pdfIn PDF document text
    • https://site-1038825.mozfiles.com/files/1038825/dijavunupurisabidubefizos.pdfIn PDF document text
    • http://turobi.ridgelinefarm.org/uploads/1/3/0/8/130814328/buneroginapesajeneg.pdfIn PDF document text
    • http://xixojosek.gwworldwide.net/uploads/1/3/0/7/130776750/1665818.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://uploads.strikinglycdn.com/files/7ab44537-410e-492f-9cc1-0cf32f8c9814/jamoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92e398a-3fa7-4ccc-a3ac-59ece93d9774/kutibevome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3d44eb-4a19-4aac-9a99-65809a5a397a/54557806495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e0e2cc-40c9-4939-b328-0d4a9de1c952/nodajemagudaleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a0a47c-946f-4116-b2eb-e5ab579efe67/3383392291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6809/9226/files/dopuxugakisopomaduk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/17989153995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6479/4522/files/88880997905.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 4624 bytes
SHA-256: f76a86bdf6df7191d390828533e128263072810f18e3017a28c4cf78cd801fe4
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10440 bytes
SHA-256: 7e4577ed2cfed15ee080086b5195c1862ceaaf7a7d9fabf3bf57055ea1c69a10
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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