Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8be8b82db6dc4fa…

MALICIOUS

PDF

37.6 KB Created: 2020-09-06 22:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc066608b004e1acc5a1ac49c6f6598 SHA-1: 2aa96c654672233ba0d0f69485324ebddcac8c64 SHA-256: c8be8b82db6dc4fa329244c50ea6b4fa926039c16b0f6d5f04f6b718fcfeda4a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to a quiz and the malicious redirector URL. This suggests a phishing attempt where users are lured to click the link under the guise of accessing a quiz, leading them to malicious infrastructure.

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.link/wix?keyword=simple+past+and+present+perfect+quiz+pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/89804337876.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/bidekenija.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/kiweliziwukesisezazufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/rexipir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/pikudejadogalomutoxivoku.pdf
    • https://cdn.shopify.com/s/files/1/0462/6586/0253/files/mcsa_windows_server_2016_complete_study_guide_ebook_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/puzulunawafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5557/files/zesukojoloxozoxazubepev.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/95557684623.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/bumuroxekuvif.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/kadesorepulabapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/14074781920.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3475/files/iphone_xs_background.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/lifulosojamavilufuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/88966217976.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/cambios_biopsicosociales_en_el_adolescente.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_off000052cc.bin
0511461e55a7729d1198d42d17f8f23dfbf51c969984281de536aa0e20e9fb55
pdf-font-stream PDF embedded font (sfnt) at offset 0x52CC 5580 bytes
font_01_sfnt_off000065ae.bin
5160892b6a500e94c18964c1fc4741d48decae2f279e7e1a9d661c2677350c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 10588 bytes