Malicious PDF — malware analysis report

Static analysis result for SHA-256 16177460af1a90c7…

MALICIOUS

PDF

48.8 KB Created: 2020-08-11 20:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7947c16ebd4557b2bcbe2543dd83f296 SHA-1: 8d18af82ca4579a2789ee2fb8db42206a530bf71 SHA-256: 16177460af1a90c77d033575333e69148bb02de0643fbbf6a3aa63440fe391e9
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. A critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=essay+on+student+life+in+200+words+pdf'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point towards a malicious redirection attempt.

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.cc/pify?keyword=essay+on+student+life+in+200+words+pdf
    • http://files.beautyessencebymerabell.com/uploads/1/3/0/9/130968994/7647256.pdf
    • http://files.nothimbles.com/uploads/1/3/1/6/131606758/f38cd64b109f3.pdf
    • http://bazeleb.westdentonibc.com/uploads/1/3/0/8/130874633/8676642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/bubileretizudizabalomugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/52648708994.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/kekubifovajemoxumiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/sufukenukoferanigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/sexese.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/nutuva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/attention_span_test_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/feguwefikezirifozomumu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7581/9927/files/mw3_hacks_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/quadratic_equation_completing_the_square_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/38728761953.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/pdf_express_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/2469/8791/files/advantages_and_disadvantages_of_barter_trade.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_off000080f2.bin
fd6173c7551c107c81b9f93d83559e7381c0a5e3f56b18774ce7a7adac5b9d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 5460 bytes
font_01_sfnt_off000093a9.bin
002cfc398e705a5ad80268949d51aac40334ad202dee00f46b443a82a4fb9c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A9 10104 bytes

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