Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a48c90024784f2e…

MALICIOUS

PDF

37.8 KB Created: 2020-08-16 20:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63ee2d2a501ff809758b5627b90cf0a7 SHA-1: 01aa28223ca4a1e4a70a0a17fa3f7511788445cd SHA-256: 0a48c90024784f2ebd9527fac0c006e2d938c26bae8238637bf2cef4c897be03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=geometrical+interpretation+of+derivative+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating a potential lure to malicious 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.ru/pify?keyword=geometrical+interpretation+of+derivative+pdf
    • http://gopit.nightwatchparanormal.com/uploads/1/3/0/8/130873715/zavilavoja-kisado-zurinuzo.pdf
    • http://files.kellydenaples.com/uploads/1/3/0/7/130775446/3874145.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/pazera.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/92002478051.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/73381558199.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9102/5306/files/fanelovenamefejodis.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/71276048167.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3656/files/treating_depression_with_hypnosis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/24070215019.pdf
    • https://cdn.shopify.com/s/files/1/0438/3437/6352/files/pipe_data.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/attendance_allowance_claim_form.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_off00005500.bin
f9e2352682d4abbd0933427246c3fbd8e821e37c85688d3e348757378da0f639
pdf-font-stream PDF embedded font (sfnt) at offset 0x5500 5212 bytes
font_01_sfnt_off000066ae.bin
a9de3bed3d9b792b7186e103b5a7bd4387e2079f110a2ff24c7e451d8c856bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 10440 bytes