Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5307c91d344dfa…

MALICIOUS

PDF

45.3 KB Created: 2020-09-18 06:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c04506105aa7208d02a1dcd2b74f90a0 SHA-1: 68c59d9e89452eeda8bb698b749ac99c8d39b34e SHA-256: 6d5307c91d344dfaf3999ac42740be10c691ce78b5d78cc5a463d8a50cc05913
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, directing users to external resources, one of which is a known malicious redirector. The presence of a 'download' lure and numerous links to other PDFs hosted on disposable domains suggests an attempt to distribute potentially unwanted or malicious software. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.ru/wix?keyword=screencast+video+recorder+pro+apk+free+download In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a428acb-1c1b-482c-bdc0-1410517201cc.filesusr.com/ugd/0bcf16_eee1f4eedee04840a72dc169b8acf22f.pdf?index=trueIn PDF document text
    • https://468630ba-e23b-4d94-9117-b29127469ceb.filesusr.com/ugd/83d902_408b58eb51b64f96b5cf587c49042b17.pdf?index=trueIn PDF document text
    • https://9c0afccc-ef91-41e5-b9a0-7b2ce4a7b429.filesusr.com/ugd/3dd68e_e6530b40b99b4142831c2787e96850ad.pdf?index=trueIn PDF document text
    • https://1a66137a-55f3-4115-b7fa-509959aad64e.filesusr.com/ugd/97aff7_0c8d8301cf2b45219f65ed714a6ddd04.pdf?index=trueIn PDF document text
    • https://c816428b-dcfe-4112-93f7-b1ceee754efc.filesusr.com/ugd/96564c_684155e86a34458b8ac7dd2aa2bd7a45.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/black_and_white_photography_tutorial.pdfIn PDF document text
    • https://b4cd3f2c-c3f8-423d-a310-c482f9b75b84.filesusr.com/ugd/e23fbb_cc545cef96fd457ba30002f600e2c122.pdf?index=trueIn PDF document text
    • https://a8b75ec9-e6e3-43ab-b63f-d7c64ff65378.filesusr.com/ugd/92ee2b_d0a07a2a52e44c689a0e0f8d89b1c781.pdf?index=trueIn PDF document text
    • https://94be8acd-d7dd-420e-a541-231f60bfb8ca.filesusr.com/ugd/90c678_c96e7f30ad5c47cc9491004a44955e1b.pdf?index=trueIn PDF document text
    • https://e310c639-63ba-4e44-8925-8bbf0a3bb8e8.filesusr.com/ugd/c33f71_c75866b087674ff3901629b703559d80.pdf?index=trueIn PDF document text
    • https://14da9c48-9148-4c5e-93f8-725926edf0e9.filesusr.com/ugd/e643da_9e0f5c8855ff4c4a8804a538b046637f.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 5468 bytes
SHA-256: ff988b664268b467fef679e48e0d8529f3326cab6c41af191a7cad699a44b5d3
font_01_sfnt_off00008018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8018 12224 bytes
SHA-256: 4fa218f05df726b50658207fedd86735db1bb1605da9b88fbacca66478225e45

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