Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e95449b785f9455…

MALICIOUS

PDF

51.3 KB Created: 2020-08-21 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bade25ecdc141bba305614f0538e7f51 SHA-1: b8b67bad540b30f51e5ced018b8208b2e47dbe87 SHA-256: 5e95449b785f94558fd73e2a6939e20e4f96b0841b4868a93971fce3e28239f2
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though obfuscated, contains text that appears to be a lure for a guide book, combined with urgency language. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=rune+factory+4+guide+book
    • http://rijexo.freehandsilversmithco.com/uploads/1/3/2/8/132815172/8bbe7f2566d6173.pdf
    • http://files.mpowertheworld.net/uploads/1/3/2/7/132740415/kadisetiwebuget_rofajanagojata.pdf
    • http://jatonikun.heyocc.com/uploads/1/3/1/4/131408899/d76b9ea6.pdf
    • http://zuxumomup.diplomainprofessionalstudies.com/uploads/1/3/2/6/132680981/zoleve.pdf
    • http://soxogoku.tanaeburton.com/uploads/1/3/1/6/131637814/warematoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/78851913733.pdf
    • https://cdn.shopify.com/s/files/1/0447/5944/9749/files/acoplar_varios.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/6470546467.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/khund_song_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/nalafofifofatiruvanusad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2342/files/elementary_statistics_7th_edition_bluman.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/79168857302.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/xaxorexatedujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/43979246303.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/33465921066.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/betigimebozomakalojusafoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644c.bin
408317f5cb2634b26fee834b8c41fea66d6bd07d4c769094ca79220e8c84c4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644C 4564 bytes
font_01_sfnt_off00007423.bin
4dc06508d64761f094b3cab96e6174b958b8dee81b03f6d546fd1acd20a48e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 5380 bytes
font_02_sfnt_off00008699.bin
5337c4621599457e6be0cb5ddd46fe33c625ecc5452993a8f4defe40b80467f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8699 10520 bytes
font_03_sfnt_off0000aacb.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACB 16092 bytes

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