Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a9a17694200b56…

MALICIOUS

PDF

43.2 KB Created: 2020-08-26 19:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab659d081d2be366eebb20ddf704b258 SHA-1: 645157df6dfec4110868dd8b785e0eb9be4ee804 SHA-256: 99a9a17694200b56a0843aafaaef402610468ed172781f0ec3ba09d05962965c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is associated with a link farm. The document body, though heavily obfuscated, contains the same URL and mentions 'Agencia de viajes virtuales', suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=agencia+de+viajes+virtuales
    • http://vowoxeva.southdevonslinglibrary.com/uploads/1/3/2/7/132740267/feratasupa-savepaxifikano-rusipuzit-kepazeve.pdf
    • http://files.galesgastrogrub.com/uploads/1/3/0/8/130814017/tigonezu.pdf
    • http://zopapu.theskintfoodie.com/uploads/1/3/1/4/131454012/8586538.pdf
    • http://debil.inthebeginningpreschool.org/uploads/1/3/2/8/132814167/kenesorixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/wobub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/45891968810.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/vesapobibukodonuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/cell_and_their_organelles_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9913/files/75026904932.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/stigma_definition_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4012/files/harmonize_new_song_never_give_up.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/google_sheets_dropdown.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/korosase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/resinaxobizezoratelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5957/5958/files/expanding_and_simplifying_polynomial_expressions_worksheet.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_off00006930.bin
7bed7f1350d21e60ffc77b06592194ad12f052432c8fabaf6b8156ac2431750d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6930 5232 bytes
font_01_sfnt_off00007b0f.bin
9074ec7ecfdd6006811cb69f8cc88e6aed952150454c566d4ee020d3dcb43bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 11432 bytes

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