Malicious PDF — malware analysis report

Static analysis result for SHA-256 932256e9a4d7a889…

MALICIOUS

PDF

47.6 KB Created: 2020-08-11 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1fb5da6bb21fba8d7b6e3cfca11d97b SHA-1: 20093e73b63ad453c69e1eefa784dd6e31a2d05d SHA-256: 932256e9a4d7a8898a20f3ec9d7c37de09d7e163907459b445ad376fa6e2103a
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL, 'https://ttraff.com/pify?keyword=teaching+grammar+for+young+learners+pdf', is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with many links pointing to external resources, some of which are hosted on suspicious domains. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=teaching+grammar+for+young+learners+pdf
    • http://vixomip.aplitlounge.com/uploads/1/3/1/4/131454526/7a843ea08c4.pdf
    • http://files.rcsccadmiralmainguy.com/uploads/1/3/0/7/130738628/fikubisufidewi.pdf
    • http://files.nuclearcompost.com/uploads/1/3/1/3/131398252/ketomapafovuderev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/7937672917.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/gopafog.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/botw_windblight_ganon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/branches_of_biology_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/reading_strategies_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4437/files/jilaxekukigiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/josefulebixek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/franchising_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8238/2502/files/32693762121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/96269781832.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8565/files/197864727.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_off00007b9d.bin
7be293a3dbc4bea7cfe57249eef2dee34d2104274e661324c23617bdbf508ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9D 5620 bytes
font_01_sfnt_off00008e94.bin
d3eeccf89c8329d112f630ac9f7e6b15ffbc90f20f429724acffbde48ef9af9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E94 10288 bytes

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