Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed554dada8528cb2…

MALICIOUS

PDF

90.1 KB Created: 2020-11-03 17:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 26036ae63b628c70a77d17040b9c9efd SHA-1: 4e5ebbbc14bcd7137f8a0812fc867feca56516ee SHA-256: ed554dada8528cb2c51fb77837cd7f789508ee65515d534f7ae560bf612e50fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to attract traffic. The embedded URL https://ttraff.ru/123?keyword=copy+and+paste+roman+numbers is the primary indicator of malicious intent, likely leading to further compromise.

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://ttraff.ru/123?keyword=copy+and+paste+roman+numbers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8d96f44a92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f88cf8d0bb1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f94ed388d3f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_5fa1547d2c733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f8a92f2da5d6.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f882ccac2a36.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/wonoti/gabel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d7c368-d6ff-4563-bc1b-23732843624a/do_d3_athletes_sign_a_letter_of_intent.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/27599299352.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/how_to_rebuild_a_starter_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/duck_life_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314f2767-607e-4384-ab1c-aaef627f1c15/wajaxamofatilazige.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/chemistry_project_on_casein_in_milk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 5220 bytes
SHA-256: 70dc1297b5ff971914b9fee98e9572f4da4c6207bd3fc57511e67f9ef23a4dd0
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10928 bytes
SHA-256: c7d2084c3f629f8acc4677283060d964f455a143948bba32bef64e9d9b5b902c
font_02_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 17060 bytes
SHA-256: 27c625da98d11a54ceb97fc84be2497be50ef2ccf8f8300437b2d467250e16fc
font_03_sfnt_off00014af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF8 6252 bytes
SHA-256: 20bc280d68f02a1630ffdce0a75040b0dc165d120766adcc6df3618dd18735a8

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