Malicious PDF — malware analysis report

Static analysis result for SHA-256 1560d498e8c0381e…

MALICIOUS

PDF

53.6 KB Created: 2020-07-30 12:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7450fc8a24d2d9c2e2eb757b4cb198c SHA-1: 0078019e8da7a0ef394b043e1eeb67fa11825668 SHA-256: 1560d498e8c0381e666922e7b2a1e2d7492926344e2c669beaae3656becc7320
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to appear as legitimate content, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector and a link farm suggests an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

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=download+majalah+gamestation+pdf
    • http://files.bartsbullets.com/uploads/1/3/0/7/130775652/wotisu.pdf
    • http://files.brentwoodbayvet.com/uploads/1/3/2/6/132681307/jitaje.pdf
    • http://files.mymothersbasementgallery.com/uploads/1/3/0/9/130968950/71a9af9f.pdf
    • http://files.womenmakingascene.com/uploads/1/3/0/7/130775033/1c57cb8485d28b.pdf
    • http://files.gaitwaychiropractic.com/uploads/1/3/2/6/132681359/kesoropojelusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajomuxufukurojudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/xofedijafofej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/36699124726.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/34795098981.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/97777909095.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/21635222562.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/pokujuwamarowazizovaxut.pdf
    • https://cdn.shopify.com/s/files/1/0434/0436/1884/files/jibagobatoxenu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c4.bin
77875f008987004aba7e637cd86a5bf8f44309a29c1887844d079a2d8645f3ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 5312 bytes
font_01_sfnt_off000086c9.bin
1e45f12ef7443ad99611c4825f8487ceded0a82b8f8f8803ad43bc1a9224f96b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C9 10216 bytes
font_02_sfnt_off0000a9f3.bin
4ec2e8c801541cb25d698083aa54ae282a523c3239112e47b15a9de6b9a1c950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F3 19408 bytes

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