Malicious PDF — malware analysis report

Static analysis result for SHA-256 6026ae17f21f0201…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 09:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e424e188ecbdf4fffe458bca7356546 SHA-1: 0cc4368645e8a9452e7a953016aef985521a4f96 SHA-256: 6026ae17f21f0201f0648920d6f166ea3b62281e043e6c25fbcbf4892dc82348
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to host other PDFs. One prominent link, 'https://ttraff.com/pify?keyword=brick+games+free++for+pc', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'brick games free for pc', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=brick+games+free++for+pc
    • http://files.morganmediacreations.com/uploads/1/3/1/4/131438226/4394963.pdf
    • http://sigoju.sunnibunni.com/uploads/1/3/1/8/131871721/tuzowazupik-xebapivuk-zonoj.pdf
    • http://zuxanobup.kirstenschwarz.com/uploads/1/3/0/7/130775350/redijuwasadetu-zenukegax-nojaku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/13110557200.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/sixuximeretefomuposofexax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/golisunijim.pdf
    • https://cdn.shopify.com/s/files/1/0464/8088/3880/files/kerejenab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/39941615891.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/92772007308.pdf
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/59484588145.pdf
    • https://cdn.shopify.com/s/files/1/0439/3854/5819/files/berazetenig.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/physics_by_james_walker_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/jawukini.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_off000068e7.bin
fe120b725a87081b0d7fc8a00f12204aca3f57f6aad57a3eee3e217813564c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E7 5416 bytes
font_01_sfnt_off00007b47.bin
d47491969a842f49f644083b6bc445b6f3bcd094fc00be4d166b52136ff3449e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 10212 bytes