Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efdc19ed1908a9a…

MALICIOUS

PDF

34.4 KB Created: 2020-08-10 12:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60bd6c1c440ea94ed7b5ea6555800889 SHA-1: b2b0833dbc03ee40056381a74ff15dd915235ee8 SHA-256: 5efdc19ed1908a9a94bf78ab52c816104f9297bd0b3d49de73433674164d96cc
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a specific manual, suggesting a phishing or scam attempt. 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 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/pify?keyword=akai+lpk25+manual+pdf
    • http://files.pauliwan.co.uk/uploads/1/3/1/1/131163737/4749480.pdf
    • http://files.greenbrierathletichalloffame.com/uploads/1/3/1/8/131872198/48ef918c581b.pdf
    • http://files.anne-marievangeloven.com/uploads/1/3/1/4/131438217/900589.pdf
    • http://files.ptartsummer.com/uploads/1/3/0/7/130775448/7412138.pdf
    • http://files.johnzion.com/uploads/1/3/1/4/131453870/mawimiti-xutula-towajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/55302883091.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/histogram_equalization_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/26610167647.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/5559423822.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/24141924975.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/bisejosem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/bizirabiki.pdf
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/56773464826.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/39907278903.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/javotogatigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/48135610594.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_off000048c8.bin
4315ef998365012b950c71107df52e5a66316ef9a95389be45f1ea61bb40cf59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C8 5220 bytes
font_01_sfnt_off00005a8c.bin
b20896c165c16674df45f6bb231f1b7a84e745aa52f3ab29bbc207704bcfdba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8C 10000 bytes

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