Malicious PDF — malware analysis report

Static analysis result for SHA-256 7814987e7c361d9d…

MALICIOUS

PDF

55.3 KB Created: 2020-08-04 22:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d72fd27201caf4caa110f40386562f SHA-1: ca6a5a66acb1e70e7fe440e6da42992f9e6e1cb2 SHA-256: 7814987e7c361d9d453dcff64d7fd4b75220960ee86c7a5df9f056030aeb2622
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector. This suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

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.com/pify?keyword=couper+pdf+page+par+page
    • http://files.jasminkwan.com/uploads/1/3/1/4/131453248/kubomerebamel.pdf
    • http://files.topcosmeticgyn.com/uploads/1/3/2/6/132681576/zobil-pokowi-tojerowu-jivewawuzonoje.pdf
    • http://files.bliss-worx.com/uploads/1/3/1/4/131452735/5083761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/can_you_believe_it_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/kodusosevipovinewire.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/25360348820.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/11929530914.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/tiwibuwixakagad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/nafedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/105159164.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/mefuvurulabokisunub.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/50918048639.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/71037279370.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/roxasulumur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aca.bin
05fe70c868d7b21edb0deae264c57394f8c2489eda2b58e01c796baefce58ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACA 4672 bytes
font_01_sfnt_off00009ac4.bin
7af7d375e05e0b2194ea9c5caed8f9c02d2d49005ffaf5008aa20b53685057ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC4 12004 bytes
font_02_sfnt_off0000c065.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC065 4324 bytes

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