Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee24158bd2a8e40…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 01:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b841726c8d0d20ae002e32c922be4a5 SHA-1: e19c1a2a7b99536e4753b2b3e23ff07cbe256d64 SHA-256: 5ee24158bd2a8e4041861939f790976481030ca3bdfa04bc964c55389580d8cb
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of a malicious redirector and the link farm suggest a phishing or scam attempt, likely delivered as an attachment.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+anger+management+worksheets+pdf
    • http://files.fostercarecoalition.com/uploads/1/3/1/3/131380842/tefatux.pdf
    • http://files.rogerconlon.com/uploads/1/3/1/0/131070331/1703251.pdf
    • http://files.iamfattlip.com/uploads/1/3/1/4/131406785/poxifijafikemezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/danutenutes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/xotarikopasojiwasele.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/71729214337.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/kasivikepatinome.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/lujabubalemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/nivalufuzosimemolemekova.pdf
    • https://cdn.shopify.com/s/files/1/0432/7781/1867/files/free_texas_holdem_no_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/ccna_portable_command_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/patak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/kavuzugisow.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/tiwafolibono.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/kibilino.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/najojeva.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_off00006d98.bin
59c8a0c3e2a8f3fdc9d69d482655c0f7d35c86a89a72757062ba522d6f75e54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D98 5532 bytes
font_01_sfnt_off0000805a.bin
bc0fd9a11112905421be05d0d3a4ad7f5200bb4c4ecc40711a39a3157dde1a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 9644 bytes

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