Malicious PDF — malware analysis report

Static analysis result for SHA-256 9670349a2a0454e5…

MALICIOUS

PDF

50.1 KB Created: 2020-08-06 06:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a288437b6fef0486046cca4ebd4d4d4 SHA-1: 49c624385bb9d26b7a7e5cdaab4c459259275609 SHA-256: 9670349a2a0454e54bc056839f9f4d8cb75a3fa21eca7ec7d93f83692ee5d924
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which are part of a link farm designed to improve search engine ranking and direct users to potentially malicious content. One URL, 'https://ttraff.ru/pify?keyword=arsene+lupin+pdf+gratuit', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Arsene Lupin pdf gratuit' and the authoring application, suggesting a lure for free content. The ML classifier strongly flagged this PDF as malicious.

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=arsene+lupin+pdf+gratuit
    • http://files.neflopioidepidemic.com/uploads/1/3/0/8/130874201/bupotupinubapamijosa.pdf
    • http://files.stbrendansreds.com/uploads/1/3/2/3/132303024/turidibutira_kesanekafasow.pdf
    • http://rozowob.3wheeldriveonline.co.uk/uploads/1/3/1/4/131409090/rixibesonax_polakomejinuko_rigab.pdf
    • http://files.ebcentre.co.nz/uploads/1/3/0/7/130738801/rugunifiwetatizalusi.pdf
    • http://files.sscoinworks.com/uploads/1/3/0/7/130776590/ribowejelexux.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/bevuganezugojerevojewono.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/lipenimamijamukipobol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/45414095656.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/16011906506.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/dillion_harper_college.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/kapuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/84486294179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/85656947292.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/welitufuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8726/files/66347118245.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/zakogelikigetuxoxoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/fizabane.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_off00006521.bin
a5675060c47447c65e5ddacfec46c96c877f270744d6cf576bb2f55ff0d4302d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 5200 bytes
font_01_sfnt_off000076e2.bin
3cc8d943c920c1379a1e1103372d15499eb9f564567673c6b4f831af817df8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E2 15212 bytes
font_02_sfnt_off0000a62a.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA62A 16092 bytes

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