Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6b7f5810f8888f…

MALICIOUS

PDF

34.6 KB Created: 2020-08-10 14:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fb882315b2b7e53333b5e724f488ec5 SHA-1: 9e041ee5798e9307d449f832d1e188dd5b92bfb5 SHA-256: 6c6b7f5810f8888f9da53ad7a598353dce9a181936b5851f0d138dfd1260654f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure for users searching for specific content, directing them to the malicious URL. The ML classifier strongly indicates 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=bhagwat+geeta+shlok+in+gujarati+pdf
    • http://wuvem.mrmyrtuesclassroom.com/uploads/1/3/1/3/131379803/1981252.pdf
    • http://fofekek.borizjersey.com/uploads/1/3/2/8/132814930/a1c234585498cd0.pdf
    • http://derakurok.thedreamteamsoccercamp.com/uploads/1/3/1/4/131438539/9927027.pdf
    • http://files.owensfamilywellness.org/uploads/1/3/1/4/131452903/malugugoxagu.pdf
    • http://files.learnandleadec.com/uploads/1/3/0/9/130968947/gafimivore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4336/4759/files/puvamofimozenulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/titifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/university_calculus_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/30975992636.pdf
    • https://cdn.shopify.com/s/files/1/0439/1708/2792/files/kolivami.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/gazuzizovutoxeviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/jaripukijovemerixox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/cause_and_effect_of_water_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/46933463268.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/21940084023.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/ximajug.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/zigizuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/junoxatadatedezewaw.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_off00004885.bin
ed468c4fa924ebebb2817a65c0b19dc78c79d339cba051697509046f3ee22cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4885 5584 bytes
font_01_sfnt_off00005b95.bin
eaf1c80debe1a6644f2e9f83c8bb81929f4ef9b0087e87bb0e5b191ace4cd4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B95 9356 bytes

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