Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f563e2e67f201a…

MALICIOUS

PDF

37.8 KB Created: 2020-08-31 10:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc486f1963bb176c895b2081ec8ca0f SHA-1: 456939456d48f660259d73d1bc116462517ee007 SHA-256: 28f563e2e67f201a005f4c5ab1b5088bac35b01b7a7eb8df8fc87128aca9006a
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=push+and+pull+worksheets+for+3rd+grade+pdf, which is identified as a malicious redirector. The presence of numerous embedded links, including to Shopify domains, suggests a coordinated effort to distribute malicious content or phish users.

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.com/wix?keyword=push+and+pull+worksheets+for+3rd+grade+pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/46297798170.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/75492452742.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/keyboard_books_for_beginners.pdf
    • https://static.usrfiles.com/ugd/ef253e_b51ef61f9d184ee8b91940a35b54c2bc.pdf
    • https://static.usrfiles.com/ugd/87a178_e48dc58f1a194a949011a46e582fc7d8.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/rusalinobopazirobo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/iron_jawed_angels_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/integrated_resistors_and_capacitors_in_vlsi_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/rizodapige.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/wixojosowitufirivaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/3757/0710/files/mavasisoloxud.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/fajupesujekipuruvusuba.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_off0000530c.bin
b65bdb9f5e88ad23f23d3f2271e52ede8eaa0e80efc21278d5765b89ce862bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x530C 5624 bytes
font_01_sfnt_off00006635.bin
c3f4b421d8855a56b9de731305284269fc9a4d21eccb82cc66d6a552b47ee60e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 10412 bytes