Malicious PDF — malware analysis report

Static analysis result for SHA-256 67252da001d00ca5…

MALICIOUS

PDF

48.3 KB Created: 2020-09-02 01:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc922f59d31bbfc4dfcf1bd8ff98c28 SHA-1: 485baa38159124fdfc883c0971247b0c24cca9b0 SHA-256: 67252da001d00ca5e1d2db3a6d3a42af86f4aa696a1808e28aed0bb3790c224d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. This is further supported by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics, indicating the document is part of a campaign to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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=the+good+place+s3+episode+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6c8f37_7cffa2d1b6be4f68b42c6a2d66cd4c6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_51cb5630d2af420e9b4b9d87dda62856.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_97e1f5fc205d43fbabbd4d34a810769f.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/pdf_to_dwg_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/culture_of_animal_cells_r._ian_freshney.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/42485743243.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/40039193910.pdf
    • https://cdn.shopify.com/s/files/1/0433/9308/9692/files/surviving_mars_events.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/starbucks_card_balance.pdf
    • https://cdn.shopify.com/s/files/1/0463/2389/2381/files/kosezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/dibidilomuduk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/ajcc_cancer_staging_manual_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/challenges_of_malaria_diagnosis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000761d.bin
13b6c4061f7faa0ea5b138a0f76f9715b54ac14e22b93d99093baa34f8b9a5df
pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 5352 bytes
font_01_sfnt_off00008857.bin
0fb4ff6a2201745be17f32fdd4fcbe0354971669b02dc89f026281bad1563189
pdf-font-stream PDF embedded font (sfnt) at offset 0x8857 14200 bytes