Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dbd52af46e2414…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 13:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b89aa14b4d5b45e80c4c2c40719019b2 SHA-1: 17526662fc5accb1ecbf0d76b6985b86e46f947e SHA-256: 65dbd52af46e241496c9b19a867621b7c2db705ef1999c055b783cf147fb48b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to a power washer manual, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to harmful content.

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/wb?keyword=husky%20kohler%20courage%20xt-7%20power%20washer%20manual
    • http://files.nvtf1.org/uploads/1/3/0/7/130738875/975cb034036775.pdf
    • http://files.eastsidewestsideswcd.org/uploads/1/3/2/3/132302942/7907143.pdf
    • http://files.oakfamilycounseling.com/uploads/1/3/0/7/130738752/7fbf02a71053.pdf
    • http://files.thebohemianphoenix.com/uploads/1/3/2/6/132695805/7630269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/rerajupisowirizujeraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/bivizoturawoxujir.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/slip_fit_tolerance.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/63278397221.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/farmer_s_almanac_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7994/2812/files/circuito_de_la_comunicacion.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/28998888689.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/centroid_of_geometric_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/penuleloroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/vulukefedapawadevekik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000558a.bin
768c053a3f8945d2cabfff1b23053d70db7a16d5cd44501cc64456c22925e769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558A 5580 bytes
font_01_sfnt_off0000688e.bin
b723eab44587275506c1ad63c3c778ea1f256cb6f1e8ab5ff64c495cfb506daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 10460 bytes
font_02_sfnt_off00008bd9.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD9 4324 bytes

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