Malicious PDF — malware analysis report

Static analysis result for SHA-256 701d746dbc632eb2…

MALICIOUS

PDF

45.8 KB Created: 2020-08-07 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10373ea1d3265fffb4bcc9bb6930786c SHA-1: 27d85319b95ba79609a60315d161e357dff4d55a SHA-256: 701d746dbc632eb2e66f23235865aed8fef73badbb726b619d786d64634017ad
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/pify?keyword=old+man+and+the+sea+full+novel+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, reinforcing the link farm and redirection attack pattern.

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=old+man+and+the+sea+full+novel+pdf
    • http://bewujirit.wheelandwedge.com/uploads/1/3/1/4/131452988/gusujedelil.pdf
    • http://files.valgbbo.com/uploads/1/3/1/3/131398419/zusiwobovim.pdf
    • http://files.crestllc.com/uploads/1/3/0/7/130776208/8833660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/92382921543.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/27479442811.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/jugewabewivix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/kerefatos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/innovativeness_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/kafozorobetexewufasu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/26513770062.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/bufagopujemajiburu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/98033439007.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/rovogavoligitamaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/lufikavumotuwabegusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.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_off000075c1.bin
60552c65613a7727525bcd0dd05201b2223024f732bdf22e834ccac96964d662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 5272 bytes
font_01_sfnt_off00008790.bin
c9f1363d29a5181abb6727285a0f3a54dbb33cb308bf49fd1b45053170371db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8790 10220 bytes

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