Malicious PDF — malware analysis report

Static analysis result for SHA-256 2433976adc6822f9…

MALICIOUS

PDF

38.9 KB Created: 2020-08-18 22:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310c19f56dfac5043f27c55a08919525 SHA-1: 2f127d4d8914438980aeaabec007c8c8ea7c518b SHA-256: 2433976adc6822f9dc8bcc584a1eafaf1a2b6269fd43b65cf803f2463db63aa7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of embedded external links, characteristic of a link farm. The document body contains a URL that appears to be part of this link farm, suggesting the primary purpose is to lure users to malicious sites.

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=card+games++phoneky
    • http://files.thesanctuaryatmn.com/uploads/1/3/1/8/131856184/d83262d07.pdf
    • http://diselezi.steinwaywhisperer.com/uploads/1/3/1/4/131482975/8370170.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/kaforewunimebipitu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/57486746409.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/rational_numbers_worksheet_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/anatomy_of_whole_body.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/muxuboxitubulotitupiwus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/matematica_financiera_anualidades_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/pilot_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/application_letter_sample_for_internship.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/22570915390.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/95274121461.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3639/files/tutiwezudukit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000568d.bin
1cd7a18edc35cdc61f65cc1cbdba3c13de8476a20af7fef1962c368e81932e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x568D 5412 bytes
font_01_sfnt_off000068d7.bin
0732a7c4f09d11ea2ab00c3431ba82b5cf16d6c33206555c93d3e288fd8837db
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D7 11828 bytes