Malicious PDF — malware analysis report

Static analysis result for SHA-256 be20e513781bd75d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-28 06:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e43ca25f41216f5d4d44d6058b8e13c5 SHA-1: f27fad0638726413ef59be4e2cc6a83166bffe43 SHA-256: be20e513781bd75dcbf5f313b296bd452680813a6a46012dea391761c388c722
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, appears to contain this URL and other Shopify links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking the malicious link, likely for phishing or malware distribution.

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=the+campfire+song+song+chords
    • http://files.pcbaseballacademy.com/uploads/1/3/1/6/131606407/pojumemarejesamekofo.pdf
    • http://jorosef.anti-agingbyrjxjelly.com/uploads/1/3/2/3/132303354/8686563.pdf
    • https://cdn.shopify.com/s/files/1/0436/0853/9299/files/ecologia_e_educao_ambiental.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/zibawimebiwubavewoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4583/files/agricultural_extension_and_rural_development.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/1048606985.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/fatinedamafisasevuxesuro.pdf
    • https://cdn.shopify.com/s/files/1/0471/0383/6310/files/puvesalexunefovesex.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/ebook_akuntansi_biaya.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8821/files/aviary_cocktail_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5953/files/kiraxise.pdf
    • https://cdn.shopify.com/s/files/1/0454/7198/9918/files/gapuvafogus.pdf
    • https://cdn.shopify.com/s/files/1/0434/2199/1079/files/slay_the_spire_calipers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/nomupo.pdf
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/new_let_s_learn_english_1_activity_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/accouchement_eutocique.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/smooth_q_stabilizer_manual.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_off00005d17.bin
abfb21b18954bf62a44f096a3fad5d1f95cd710df754d27d0df148cdc3618144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D17 5488 bytes
font_01_sfnt_off00006f97.bin
86c982ab359f80cded07bdd4808b8f330560c55c187ce742abf4dd7554d14b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 10140 bytes

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