Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ebd4a2e966eacc…

MALICIOUS

PDF

38.0 KB Created: 2020-08-15 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8666b4f42bbbe7690d3915afd2d9797 SHA-1: c38567b8b344cbdd83457f7b9739b26bb9cd2adc SHA-256: a9ebd4a2e966eacc40baa9277e212bd3911d9965dd5d3919b16541b031ee2b13
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body and embedded URLs suggest a lure related to downloading PDF files, which is a common tactic for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is designed to lead users 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=types%20of%20computer%20pdf%20file%20download
    • http://files.actservices.net/uploads/1/3/2/7/132741109/7835836.pdf
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/dafavalas.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/presente_simple_y_continuo_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/dawoodi_bohra_hijri_calendar_1439.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/jibufudaxoxolexomuguxeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/o_balma_odia_song_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/kuzese.pdf
    • https://cdn.shopify.com/s/files/1/0437/0894/0441/files/asbaab_an_nuzool.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/63955870502.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_off00005761.bin
561435e286a039c7c5ace30362c3e669a0661ace2014e37e4dd01faa2b147979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5761 5444 bytes
font_01_sfnt_off000069e3.bin
00c50ff296e52738aaae620b1660ac67f7b1e7770f82dfa120f62eb2f2566846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E3 9952 bytes

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