Malicious PDF — malware analysis report

Static analysis result for SHA-256 d137298aa03991d9…

MALICIOUS

PDF

50.5 KB Created: 2020-08-23 17:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c4f9b476d5bf7aa820176cf2dc9c6a SHA-1: a07196a821d481cfbd97d0f923688b58a52aec25 SHA-256: d137298aa03991d942ded99f022015553731118e11bcb69ad43cef60bda682c9
150 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 'https://ttraff.cc/pify?keyword=sheet+music+eine+kleine+nachtmusik+piano'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same lure text and URL, reinforcing the malicious intent.

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.cc/pify?keyword=sheet+music+eine+kleine+nachtmusik+piano
    • http://xipoxa.anndcroghanart.com/uploads/1/3/1/4/131483416/jarozanax-lenenogaru.pdf
    • http://files.chezchase.com/uploads/1/3/1/4/131453054/ebbacbc25c0a9.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/gufujoxuwife.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/74505722828.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/stock_market_basics_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/63425738000.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/forrester_research_reports.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/american_pie_book_of_love_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/kebexumowamoreti.pdf
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/smartscape_3d_for_navisworks.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/kajajeposilojafakekeguk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0630/files/jilurililomosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/cocoonababy_nest_fitted_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d3.bin
2e33611bc5be0da9e77d7fb871a3ab4c5949ad332777cfb7e262126e62c15ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5244 bytes
font_01_sfnt_off00007488.bin
913db0d7d0ff5d7cbb2275975324abb02cd5971402da4b9509e073fe35c67983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 15860 bytes
font_02_sfnt_off0000a609.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA609 16100 bytes

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