Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc528c8c257fb350…

MALICIOUS

PDF

60.8 KB Created: 2020-08-24 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd8cdfacad6f138dd0c58e417579b9e SHA-1: cbb9bdafe755b4cad982610d81f6ca627f419439 SHA-256: fc528c8c257fb35001db456c8165c431cb81c78b5bfa7ab95d4a18471a51dd9a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. The primary link, 'https://ttraff.ru/pify?keyword=bleacher+report+nfl+power+rankings+week+11', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, aiming to lure users to malicious sites through seemingly legitimate search result links. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a social engineering attack.

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/pify?keyword=bleacher+report+nfl+power+rankings+week+11
    • http://files.hillsviewmontessori.com/uploads/1/3/0/8/130874210/1251669.pdf
    • http://files.ovillavet.com/uploads/1/3/1/4/131408798/pisujumazisab.pdf
    • http://files.eastlakecongregational.org/uploads/1/3/2/3/132302916/6851984.pdf
    • http://files.sfsailing.org/uploads/1/3/2/6/132695636/453de08241ec7c.pdf
    • http://budalunof.hydrologicsportfishing.com/uploads/1/3/0/7/130738667/4172698.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/49465695027.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/action_plan_template_for_special_education_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/kanuxanudebolomejofesepof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/15570932609.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/resufivurofefilogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/human_body_organs_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/curriculum_and_material_development_in_english_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7877/files/ielts_academic_reading_practice_test_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a345.bin
123201939010b9f373ecac64fa8034953b59b5a6e234883f703dc3b19b52cd9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA345 5324 bytes
font_01_sfnt_off0000b56c.bin
db0428e66c74d0589ed501fdef9fbbf0fb3f624b4ec90c693e7f45a3e7a14863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB56C 10240 bytes
font_02_sfnt_off0000d84d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 4324 bytes

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