Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a9ecc72a242220…

MALICIOUS

PDF

37.3 KB Created: 2020-08-11 18:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbca3012db95bd4e93412fe76dbc2a87 SHA-1: 80f317a03f430afc629fffce76110b406ca99ee3 SHA-256: 04a9ecc72a242220a31f5386bd2ea555f2c9361fa368ae7495b1b3c2842e5630
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=%25C4%2591%25E1%25BB%2595i+file+%25E1%25BA%25A3nh+sang+pdf'. The document body also contains this URL, along with numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection scheme. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=%25C4%2591%25E1%25BB%2595i+file+%25E1%25BA%25A3nh+sang+pdf
    • http://files.thomasjcoppola.com/uploads/1/3/0/7/130739062/sedodifikuvifox.pdf
    • http://files.melfoster.co/uploads/1/3/1/0/131070434/d7fd112ca57586.pdf
    • http://files.kristinuhrig.com/uploads/1/3/1/8/131857562/6a02ea0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/61961002055.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/59351632593.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/ctf_flag_in.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/refedalake.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/fulevere.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/mike_byster.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/kuwefokepikax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/kupuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/que_es_un_acta_constitutiva_de_una_empresa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/fuledodiriliwasaw.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_off00005112.bin
a527e6425232a3c236c5132c9061f327f28cc7309d8e8b8060006b88e51c9a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5112 5692 bytes
font_01_sfnt_off000063a9.bin
e12aa0dd8d923241431c317320045e313d986f98526907248fc93a661ea8d1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 10356 bytes

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