Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f370c1c2520f0…

MALICIOUS

PDF

42.9 KB Created: 2020-08-26 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b8aa76c5c5c3b25655f734527aa66b SHA-1: 37266d25804a675bd48a40448b2291dda6479966 SHA-256: 122f370c1c2520f0d315f5c61e18336265ec01d800af57c64ca48afbeb7de440
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a large number of external links suggest a link farm or phishing attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass security controls by suggesting a password-protected archive, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=cuestionario+de+excel+resuelto
    • http://files.terralindapediatrics.com/uploads/1/3/1/4/131437457/1805852.pdf
    • http://files.trailtothepeople.com/uploads/1/3/0/7/130739043/bavupurope-kosagafavujirub-lagaximutal.pdf
    • http://files.simons-petsitting.com/uploads/1/3/1/4/131437385/wowelopisuxet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/67213850676.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2855/files/arab_horror_movies.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/chucky_full_movie_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/astm_plastic_pipe_standards.pdf
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/better_than_carrots_and_sticks.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5861/files/free_name_badge_design_templates.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/femuzibuworikidomunebefal.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/38325407182.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/factoring_quadratic_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/addition_to_10000_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/72583245540.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/jederakagoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/schools_of_psychology_behaviorism.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_off000066a7.bin
64072814b0e2327062db5440b6488d87eea5c4b3c3b0619a76489db75f0259f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 4908 bytes
font_01_sfnt_off0000775e.bin
3abd45ac8deef5a4ab90afb0713c91473b4ea206fd2eb9e73bacfd6f7ef5cec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775E 11732 bytes

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