Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed756834e8df8048…

MALICIOUS

PDF

33.3 KB Created: 2020-08-21 18:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1964153104beb2692118e4a185c9db41 SHA-1: 1d93db5447e70cb73004bd17ef42d0d983ba8174 SHA-256: ed756834e8df8048e4b957c0e4d5922d84fe6e925eb9b82d1f894c4e4d65abcf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=mod%25C3%25A8le+cv+format+banque+mondiale, which is designed to redirect users to further malicious content. Another heuristic indicates a PDF link farm, with the first URL being https://cdn.shopify.com/s/files/1/0436/9498/1273/files/superannuation_employer_contribution_form.pdf. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=mod%25C3%25A8le+cv+format+banque+mondiale
    • http://files.rehanlab.com/uploads/1/3/0/8/130814280/sitedewi.pdf
    • http://files.fishinkenya.com/uploads/1/3/0/8/130814225/petokipokopones-lipositep-vurawupubaz-kipara.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/superannuation_employer_contribution_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/zasazarovuzonekevi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0800/7072/files/kasevadasemifojikog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/15139862198.pdf
    • https://cdn.shopify.com/s/files/1/0431/0302/7361/files/tecnologia_1_enfasis_en_informatica.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/abdul_qadir_jilani_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/88789984905.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/disineruzejedogeruge.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4778/files/zeloxerebojekose.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/xikimazesobomadoneba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/28945169117.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/31012280332.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_off0000420b.bin
88fd0f31fd7f35332cabad444bc8cd640f72017eed518c8fe2b5cfa65795987a
pdf-font-stream PDF embedded font (sfnt) at offset 0x420B 5460 bytes
font_01_sfnt_off00005450.bin
3a4cf3ef42006c3d773340cfd841e5db8e408d9088dba3a1c9234950d8ef21cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5450 10552 bytes