Malicious PDF — malware analysis report

Static analysis result for SHA-256 682fc19fbf7f9833…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 11:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f2095c54efb3084a772cf6b4670aa54 SHA-1: cbedcb73324eeff8f4ada27d97fc9862c52117df SHA-256: 682fc19fbf7f983327ad5e5a467589d053b8439cfdd9e1e0a5e91b6f3308d47f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests an attempt to lead the user to malicious content under the guise of educational worksheets. The ML classifier also strongly indicated 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.com/pify?keyword=subtraction+with+regrouping+over+zeros+worksheets
    • http://files.number25deli.co.uk/uploads/1/3/1/4/131407445/1395744.pdf
    • http://files.printable-ebooks.com/uploads/1/3/1/3/131382018/wepolofas_gajitavunuseg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/npr_and_ncr.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/billionaire_habits_in_21_days.pdf
    • https://cdn.shopify.com/s/files/1/0434/9001/7430/files/apple_music_family_sharing_iphone_and_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/abnormal_uterine_bleeding_figo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/marlon_brando_songs_my_mother_taught_me.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/sqlite_format_datetime_timezone.pdf
    • https://cdn.shopify.com/s/files/1/0451/0502/1091/files/83436047055.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/the_world_history_textbook.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_off00005ac3.bin
6fdc467188dcebe0084da44b75c19da95e3a8f6fe57c6b944daf775673cb0e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC3 5672 bytes
font_01_sfnt_off00006e26.bin
3300554bf801be88b1b269bf02c1c9afc34e7b6d7ba78525ae469f605116b440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 9912 bytes

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