Malicious PDF — malware analysis report

Static analysis result for SHA-256 727b3a2aa02fc181…

MALICIOUS

PDF

45.1 KB Created: 2020-08-03 00:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f2ee2f860edbd483a1e984e5e9b5c6a SHA-1: 70797fd4ccab4b7c19ba5c0193c91c5982aef5a9 SHA-256: 727b3a2aa02fc181d49a37830c120c3ca227bc83e1b94a972fd81314c430ca23
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=manual%20de%20usuario%20samsung%20j4%202018'. The document body, though partially corrupted, contains text suggesting it is a user manual, which is a common lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious.

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.cc/wb?keyword=manual%20de%20usuario%20samsung%20j4%202018
    • http://files.sjosephpsychotherapy.com/uploads/1/3/1/3/131398221/7259308.pdf
    • http://files.uniquestationers.com/uploads/1/3/1/8/131856134/vexilupurajoja.pdf
    • http://files.gfwcsylvaniajuniors.org/uploads/1/3/2/8/132814050/a88e8e1fe3.pdf
    • http://laroti.havelsflowers.com/uploads/1/3/0/7/130774993/vurejevazuk-fusimosinitula-vosazejotiza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/figijirodozavikenitonezas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/48217450162.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/72439773198.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77636621448.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/23698379828.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/bogumabatalesote.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/41487218929.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/python_priority_queue.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/voxesize.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0441/0982/4152/files/xufuzobelekiluk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/mijesolodavozemusubalem.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bae.bin
95fc1f2e67cab32f95a295a0a15749fc4104e0001f57fcd8208824ef0a3c75a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAE 5832 bytes
font_01_sfnt_off00006f7e.bin
23bff5989b61df33442e41ad547222f4234294f54f0f189ce4a936f42214d3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7E 6792 bytes
font_02_sfnt_off000081a7.bin
690ada58ed9490b7c493c25e2b43e7e4ae8e85fc78910ccf6cd6b3a7b2424664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 12332 bytes

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