Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d7bbc9c5fa5d6d…

MALICIOUS

PDF

37.5 KB Created: 2020-08-11 14:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf0cf8639a79e6451222cb2524616875 SHA-1: 731fe786270138090aca6200d125efb8878b3ca4 SHA-256: 21d7bbc9c5fa5d6d65ec6c60596ff9616ae1575f3d5a863be130813fbcedd42d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on 'cdn.shopify.com', suggesting an attempt to manipulate search engine results or distribute further malicious content. 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=manual+de+execu%25C3%25A7%25C3%25A3o+araken+de+assis+pdf
    • http://zezonawu.westoakdesign.com/uploads/1/3/0/8/130814526/72a9f581b1cd19.pdf
    • http://files.arcpressurewashing.net/uploads/1/3/0/7/130739204/18537.pdf
    • http://newob.ancestorsinmyattic.com/uploads/1/3/2/3/132303195/fuladi-nufusegat-gisabinojudolo.pdf
    • http://files.novacheer.org/uploads/1/3/1/4/131483138/5706089.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/introduction_au_bouddhisme.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/buvugaripajixilafolezawa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/gasasiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/basic_electrical_engineering_notes_1st_sem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/sonic_1_beta.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/jotopukederav.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/adjectives_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/venture_theme_shopify.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/25165477376.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/alltime_low_time_bomb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8091/6893/files/electronics_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/lamisebaxamuxexe.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_off00004e46.bin
73b67d6627ba456219875e2c929aa53372d230af188f3a54ebdd114f274a16db
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E46 5788 bytes
font_01_sfnt_off00006132.bin
3dafe73241bd3c5485b119fe87372c9bb9d8478e82731737243b9ceea6db3902
pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 12428 bytes