Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa8861549a6dfed…

MALICIOUS

PDF

53.5 KB Created: 2020-08-10 06:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1a5783e49ea1f42dd774cf3b9edaeb SHA-1: 53127b405e7475482708e47b59e445078e9904bb SHA-256: 3fa8861549a6dfedb1c2762242c74a3de36440604c85408d797d2296f711ee17
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a known malicious domain, disguised as search results for "agnus dei piano chords pdf". This indicates a link farm or SEO poisoning attack designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=agnus+dei+piano+chords+pdf
    • http://files.timothy-tate.com/uploads/1/3/0/8/130814475/rosapoj.pdf
    • http://files.sacramentobarons.org/uploads/1/3/0/8/130814229/9727397.pdf
    • http://files.zenbeautychester.com/uploads/1/3/0/7/130775619/rojeg.pdf
    • http://files.jopatti.com/uploads/1/3/2/8/132815748/ad198fb7.pdf
    • http://files.marriedmeakiwi.com/uploads/1/3/0/7/130775413/xikiremasanu-kipepidajaxovis.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/43746982980.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7152/files/bukal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/ledibubutuzawanigej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/gekagolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/12171903139.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/pufurevivubanojofezofeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/89788940142.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/motion_picture_motion_pi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/ccrn_study_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/discussion_text.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_off00009035.bin
829f7dc8d2082f718d1408171ad6913b278869086425f2275f52ea67f220475f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9035 5372 bytes
font_01_sfnt_off0000a279.bin
85ce9884e74ca963fe41bf7b279c096b30432169c1fbc1cbfbb6b78779346634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA279 12216 bytes

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