Malicious PDF — malware analysis report

Static analysis result for SHA-256 603f515bb9cc070a…

MALICIOUS

PDF

39.6 KB Created: 2020-08-24 09:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae30e03c1d25004996005d91d495c3ec SHA-1: 890672c7ddd2fb77aed3e3de62f21fbdc3f68b24 SHA-256: 603f515bb9cc070a366222fd7ad46b3eb97c41273914a279746902c3e623a25b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, masquerading as a link farm for PDF downloads, with a specific lure mentioning 'understandable statistics 10th edition pdf'. One of these links, https://ttraff.ru/pify?keyword=understandable+statistics+10th+edition+pdf, points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing.

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.ru/pify?keyword=understandable+statistics+10th+edition+pdf
    • http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdf
    • http://files.npdwc.org/uploads/1/3/1/8/131856232/kadawox_rifumijuvev_zokakilulalen_wowatepa.pdf
    • http://zemanuge.healthybalancedbodies.com/uploads/1/3/1/0/131070420/fezatiwi_pexezurutar_temonuzupup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/fejotaroxala.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9768/files/18066587241.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/dufilekoradetotux.pdf
    • https://cdn.shopify.com/s/files/1/0437/6097/6021/files/wifezolovafadifituwebej.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/entrepreneurship_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/ginodajavidupuzufi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/31435372308.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4917/files/immunoglobulins_types_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/18135275499.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/29154844043.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/60497917457.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/mewaburide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b9d.bin
4f0ce8e25eade83aa3241337414d6465e65f9fc481a0f7b932232a97f29c8a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9D 5568 bytes
font_01_sfnt_off00006e7f.bin
8d79874ca5b832c6fd49162c17fadee41e964ce762325cff5254c0e113d7f9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 10240 bytes

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