Malicious PDF — malware analysis report

Static analysis result for SHA-256 18923a0b3f6e19f1…

MALICIOUS

PDF

52.4 KB Created: 2020-08-02 21:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef238fbe0c18db9032b1f191fe759215 SHA-1: 37bdfee3aa0e74221ff7266806e67b95c0c8b01d SHA-256: 18923a0b3f6e19f1282141afbe19c32c7f8135ef1b48d687e3f01f5648668561
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised with a seemingly innocuous keyword. The file also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful content.

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.com/pify?keyword=java+code+for+tic+tac+toe
    • http://files.elizabethwoodrum.com/uploads/1/3/1/4/131453522/folobajosejurasasa.pdf
    • http://files.iremuny.com/uploads/1/3/2/8/132814589/8c9368e520.pdf
    • http://files.entartetekunstliteraryreview.com/uploads/1/3/2/6/132683135/1535575.pdf
    • http://files.tradstonework.com/uploads/1/3/1/3/131381288/723705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/20102596851.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4512/files/mipewuzoka.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/84454177444.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/titamixiwizubezakijogemuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/lileliwutojokuvelezepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/zavolamolozepade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/babazewosaje.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/30396581121.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/17856995862.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/58702012411.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e8.bin
662cb7aaa4b1ef2f8d4e381f7696963016ab96b58ccd3b9fd0dc58675f53d05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E8 4856 bytes
font_01_sfnt_off0000777f.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 1800 bytes
font_02_sfnt_off0000800c.bin
8fa2aa640c08f1ddd7613c0cf274db22fedae4867951789f749503eef16997ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800C 14856 bytes
font_03_sfnt_off0000aefc.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 16164 bytes

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