Malicious PDF — malware analysis report

Static analysis result for SHA-256 af41d353345afe54…

MALICIOUS

PDF

43.1 KB Created: 2020-10-27 05:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f51b1731970c877307a1de12f6a74aed SHA-1: e0a97e732240896a4499557028d1889fb57fe8d8 SHA-256: af41d353345afe54f8d3df803e9cd20c5af1bd403b65565218e5d2af98d65d58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the URL https://ggtraff.ru/123?keyword=first+aid+rapid+review+anki+2018 is associated with malicious redirector infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests the document is part of a larger network of linked PDFs, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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 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://ggtraff.ru/123?keyword=first+aid+rapid+review+anki+2018 In PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/fewebuvasafusog-wewesederi-kavotij-lotuwel.pdfIn PDF document text
    • https://xokafewapi.weebly.com/uploads/1/3/4/4/134488510/zolupomazuxureni.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/tagifasazarobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9844/6231/files/35537417205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/hiawatha_light_rail_train_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0077/3796/files/69474827779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2353/2710/files/31096143901.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/vafapat.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wuwalafuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9014/7007/files/kali_linux_apk_download_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/xepiruzebulegex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2721/6037/files/how_to_make_a_checklist_in_word_2010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8694/7500/files/wisomikovebakorimosixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2212/2660/files/miqe_guidelines_for_qpcr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0605/3533/files/online_shopping_topic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/vujosiwimega.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674E 5612 bytes
SHA-256: 4d3395b5b58e2c355fbd1a6cf7f277e9dd9c2fc07296002dac7481f142b197a0
font_01_sfnt_off00007a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A95 10832 bytes
SHA-256: 5da8c20a980033a2c5c46c87c5777b5fe699af582673d120e121576c672d38e3

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