Malicious PDF — malware analysis report

Static analysis result for SHA-256 13edf96af0117aaa…

MALICIOUS

PDF

33.9 KB Created: 2020-09-14 02:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5367acad0a18ae2b5b3f2732b415035 SHA-1: aefec7b4fbd69786f44f63f9a963b30ae674d588 SHA-256: 13edf96af0117aaa914988f3e5ef566896855d0946fdf8f0e45e791ff0aacf10
194 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are algorithmically generated and point to potentially malicious infrastructure. The primary lure appears to be a link disguised as "Street sesh unblocked", which redirects through a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to drive traffic to malicious content, likely for phishing or malware distribution.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.link/wix?keyword=street+sesh+unblocked
    • http://files.dolphinrealtyhatteras.com/uploads/1/3/1/4/131438142/bipekaponafovum.pdf
    • http://javolur.on-sitept.com/uploads/1/3/0/7/130739164/talakupewusozava.pdf
    • http://giges.yourpremiersupplies.com/uploads/1/3/2/6/132683014/wabusufeda.pdf
    • http://xewexog.educationalpsychologisttherapy.com/uploads/1/3/0/8/130813364/9f0456e1a46d.pdf
    • http://kagigis.homecompanyservice.com/uploads/1/3/0/8/130813604/joguvatitonoz.pdf
    • http://files.nancyhendersonwriter.com/uploads/1/3/0/9/130969873/624899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0b46e6_9617f307b6cb4089a38cfe65bfe01fef.pdf
    • https://static.usrfiles.com/ugd/0d089b_f40f4633fa7a4e0297c792d7c31be785.pdf
    • https://static.usrfiles.com/ugd/4cf28d_ec1c3f32ca8e4c2fad4a305ad4138c85.pdf
    • https://static.usrfiles.com/ugd/162fe6_078574a7e710446a8420c85a45825d8b.pdf
    • https://cdn.shopify.com/s/files/1/0465/3747/4206/files/34736611434.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/pennies_nickels_dimes_and_quarters_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0448/5152/7842/files/biology_sylvia_mader_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1221/7241/files/nefiwibogagami.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_off00004851.bin
2bce275aca1e975f80d088a331c1ce5259e9ee588d340ae3cb5bc4b55f4da117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4851 5124 bytes
font_01_sfnt_off000059b6.bin
8cd0ca7c699fceebe70b2d078cc944a879399de57a62f3ed1a46e29d2a8b8747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B6 9776 bytes

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