Malicious PDF — malware analysis report

Static analysis result for SHA-256 829096b16eb977f4…

MALICIOUS

PDF

42.0 KB Created: 2020-10-16 13:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a5abe9f5f15617a3ba06e9937b1fa747 SHA-1: e63d8a27e450d0289bdc79e2e24547f98fc9eba0 SHA-256: 829096b16eb977f4f2ac0cce1bfd2a412a6d6526501bb5f2fcbf0b4c60e7699c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'diary entry worksheets for grade 6'. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt.

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=diary+entry+worksheets+for+grade+6 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f88f167ba746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f881ad495683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f88a6bbaedd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f8854e3ab3f7.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/kezifadakog_xukavaparig.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/besejisuwetilow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf97e7e-fb31-4956-8171-56a34e85ece4/9913482933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf0f254-d893-4569-8e2d-8afd34900b50/koresalifez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db957d87-6ecf-44f1-8554-6e98f571199e/gixolozovilalagiluguku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d651d3-fe2a-49f3-a309-be70c1a3bde7/foreberusadewawamode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a506836-b8b2-4d5a-b453-de87deda601c/kuwopadelajoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73a5938-26a8-4e86-a52d-e2f0dc9eb83a/zejulomidobawuzuxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbb87b0-753b-495c-8e28-cfafb5291ce4/xisejubawimemidisezuraro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/92457873091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0801/5513/files/46251545987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/5129/4376/files/milixajilelizugafonapuvef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5291/9703/files/creed_movie_google_drive_mp4.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_off000066fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5548 bytes
SHA-256: 24f8b69c443e8d415522e0195b4ee46f42964daf9f20089d57222de43bf86abc
font_01_sfnt_off000079f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 9648 bytes
SHA-256: d1012c169bbbeddb126bf8e4d95ef2987d5061334e14a80a5c6c5db4ef10480b

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