Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecc3e7da530b7a2…

MALICIOUS

PDF

39.4 KB Created: 2020-08-28 11:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7e2fe4ba94d1d62b23485d43686f4f SHA-1: 268603ada2f0dbcde2214f7ab27ef02dcc1834d6 SHA-256: 5ecc3e7da530b7a2f28cd71ccd448362bfbe13fce0bc2ad370523ef80ccf9c76
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/pify?keyword=unlock+download+without+survey', is designed to trick users into downloading something by claiming it's unlocked without a survey. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.me/pify?keyword=unlock+download+without+survey
    • http://pukop.chimericaltech.com/uploads/1/3/0/7/130776228/1f0db165fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0794/0520/files/83486162706.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/sirunilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/90138235607.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/89983136809.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/nomenclatura_de_alcanos_iupac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9768/files/botugevigojevop.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/39278222583.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/konerilevig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/murinonapubegaj.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_off00005c3d.bin
d1f342b6f0d7be9ab1e85533123c7d83b5b0c569d104b44cd16d0c775036c37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3D 5336 bytes
font_01_sfnt_off00006e70.bin
56ebaf33090a8806853d1be8510d6a733e1498713e577c34c0bfa53e8e970d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 10180 bytes

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