Malicious PDF — malware analysis report

Static analysis result for SHA-256 b192efcc6e5303ad…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 03:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87b9c1092b882245f4f2feebb9a9991 SHA-1: 2c56f43467d27a19b24cc2d8f66245f35191e89f SHA-256: b192efcc6e5303ade652ae972681667618d785a96e62969cd802fe4430db0bb3
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and being part of a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and heuristics point to a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=backcross+method+pdf
    • http://files.joshuamilton.net/uploads/1/3/1/3/131398541/nogojaxokatu.pdf
    • http://dapikij.lowermerionfop28.org/uploads/1/3/1/4/131452903/72d2cc795d.pdf
    • http://files.melaniebates.net/uploads/1/3/0/8/130874322/vopofejazepagi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/40275832908.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/21052344273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3383/5173/files/bowenadozixixul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/jefamijurefiludom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/tugobonexis.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/28132389046.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/e_marketing_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/lazomabakejuxuvus.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/jerry_kuhnhausen_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/pugaxeledarubelaxejiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/gamidolukigojajidalago.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/atom_zombie_smashers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006710.bin
98dc99986b1628aca4144d9272c2a4d0c23a94db568934a2f38c8d2526a685c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6710 5476 bytes
font_01_sfnt_off0000798d.bin
6cf85ad5b80a56f75a230c34c4050c400526d371d157714829b97b3be0ea385c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798D 10108 bytes

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