Malicious PDF — malware analysis report

Static analysis result for SHA-256 1586c18c93f7278c…

MALICIOUS

PDF

47.3 KB Created: 2020-07-22 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68cd4f9cf0f295770b9287aa4d52ffb4 SHA-1: ef0faba26f3d2d3c00031debda0f4408259e5da9 SHA-256: 1586c18c93f7278ccbf5fe260d9f23cf35c6039904c8b4e3a24a831357645d74
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or host phishing content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links points to a phishing or content-luring attack vector.

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=autosuggestion+%25C3%25BCbungen+pdf
    • http://files.joecostin.com/uploads/1/3/1/4/131453045/4272390.pdf
    • http://files.hanovermassage.com/uploads/1/3/1/4/131406395/8821627.pdf
    • http://files.thecoachmensclubhouse.com/uploads/1/3/0/7/130739690/5ddd5ad2ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/guvemegubizubaloz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/42140253853.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/gokiledimebebaxagadusali.pdf
    • https://pobiwinut.files.wordpress.com/2020/07/lewuvivobitokegetaro.pdf
    • https://tipaxoxabenu.files.wordpress.com/2020/06/58438832687.pdf
    • https://kufopamasez.files.wordpress.com/2020/06/maxokuxewavigit.pdf
    • https://janavitim807994190.files.wordpress.com/2020/06/burabimidosivanukatal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74808095599.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/81998364001.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/pevitalawofug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/10230324971.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/3886560678.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/68696866840.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/merebogixibasi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/xijikinim.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_off000079ee.bin
b7492774dc52b085b34c2a5c78783f979fc49c41ad0dea2433ff86c6c78e8076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 5004 bytes
font_01_sfnt_off00008acb.bin
e35abec8995e59134c850d09e21b79f25d53452a11191f2ba09a8a30d79799b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACB 10816 bytes

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