Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f9f6f36a9b27f0…

MALICIOUS

PDF

75.6 KB Created: 2020-07-22 22:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da14c5c9822e637150f1d9f09269ea6f SHA-1: 3d90383046f139287737ac387e3fa25b3ebeada6 SHA-256: a3f9f6f36a9b27f0251f51ab5a5c3f7dd5e85dceb531935fbe92733603553dc6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests it is a lure related to 'experimental design in educational research'. The presence of many external links, including those hosted on Shopify, indicates a likely attempt to drive traffic to malicious sites. The file type and heuristic firings strongly suggest a phishing or malware distribution attempt.

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/wb?keyword=experimental%20design%20in%20educational%20research%20pdf
    • http://files.hptennispro.com/uploads/1/3/1/0/131070144/lisigazun.pdf
    • http://files.rachelfoxfrazier.com/uploads/1/3/1/3/131380666/jiroxosogo.pdf
    • http://files.a1landscapedfw.com/uploads/1/3/1/6/131637763/xopoxudeki-gijovas-bozisemewuzalal.pdf
    • http://files.petrapreschool.net/uploads/1/3/1/4/131454262/314fdf.pdf
    • http://files.islaviolinecolodge.com/uploads/1/3/0/7/130775940/fejuxip.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/12001704533.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/28300833043.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/34756694242.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/25078126372.pdf
    • https://jiwafose.files.wordpress.com/2020/06/77371332507.pdf
    • https://dowutoweviki.files.wordpress.com/2020/07/vowoxomudonenuda.pdf
    • https://nuximozagoge.files.wordpress.com/2020/06/duxapatesuxov.pdf
    • https://juvolezo.files.wordpress.com/2020/07/zatori.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/92572062649.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/54692915015.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8947/files/mazenafujipogiloxaxunuto.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/79213310897.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/vesaxulelixirojeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/2217/0787/files/kopabe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/fekaviridol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/79473157231.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/76492363198.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_off0000e9b8.bin
3b0d97de6e7c92f1646c6fad6fc9f01f207aee2fcc2cda2c8a42a81bc5a5e7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5476 bytes
font_01_sfnt_off0000fc27.bin
c96780daec75c5deccfec12f0e6860be6b7bbdba0ef58ef35fa96c053623e7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10460 bytes

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