Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0a4783ea36e694…

MALICIOUS

PDF

42.4 KB Created: 2020-08-05 00:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb299111153ff7e183c97616e2c1339f SHA-1: ba1f64cd64cf191769c3171b18059fba149b5ecf SHA-256: 0f0a4783ea36e694e3e4e97daa7fe063611fcb6fa25a173f8d50f17775645957
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 PDF files, suggesting a link farm or a method to distribute further malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=free+download+asme+section+ix+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'free download' and the malicious URL, reinforcing the lure.

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/pify?keyword=free+download+asme+section+ix+pdf
    • http://files.cmoseleymusic.com/uploads/1/3/1/4/131438313/rurojibimilix_dunox_waxas.pdf
    • http://files.jaxmta.org/uploads/1/3/1/1/131164479/dd11544a18286.pdf
    • http://files.convictedprinting.com/uploads/1/3/1/8/131871518/vazevavumina.pdf
    • http://files.rangersafc.co.nz/uploads/1/3/0/7/130775135/bosese.pdf
    • http://gudirawow.painterly.shop/uploads/1/3/1/8/131872269/zowawifom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/67889521.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/jegaxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/36327988508.pdf
    • https://cdn.shopify.com/s/files/1/0440/5130/0517/files/zabedamusajone.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/nobokaraletawametube.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/5527677245.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5047/files/kabbalah_black_magic.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1071/files/suruxolujes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6688/files/52933247036.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/resujulonegagiro.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_off00006680.bin
fc0ae2e956f076b45b5014f0fa079182570e1bf83d01ee02772dd552f59f6497
pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 5416 bytes
font_01_sfnt_off000078f4.bin
01484a240ec15962b0990383676c13db3622d66f29a7a9cfd9c478019e98a023
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F4 10760 bytes