Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c50dab44be8cc8…

MALICIOUS

PDF

49.3 KB Created: 2020-08-03 06:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd62f456ef2821f7937f23e6ba63a28 SHA-1: 2a910a4f576435ffe6931ee554fed709fdfa2671 SHA-256: 14c50dab44be8cc8a96d7b227ca6098b2345b22ff6e53bd115a8e298264f2680
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector URL, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=nwmls+forms+pdf', suggesting a lure to download further content or visit a malicious site. 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/pify?keyword=nwmls+forms+pdf
    • http://files.louisewknight.com/uploads/1/3/1/3/131384663/132813.pdf
    • http://files.jcudiveclub.com/uploads/1/3/1/1/131163613/bofivoza-vapelafusazo.pdf
    • http://files.combslong.com/uploads/1/3/0/7/130738548/7954909.pdf
    • http://files.koffienator.nl/uploads/1/3/1/3/131398174/2486915.pdf
    • http://files.palumbofamilydentistry.com/uploads/1/3/2/6/132680986/32ccd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/mulotafopadozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3526/2104/files/92658221772.pdf
    • https://cdn.shopify.com/s/files/1/0433/5435/7915/files/google_sheets_spell_check.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/31706688879.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/23540218486.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/390833347.pdf
    • https://cdn.shopify.com/s/files/1/0432/0732/7904/files/pearson_algebra_1_common_core.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/79697978908.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/24956212904.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/zamasalufapovobajipatuzox.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_off00008390.bin
744064d12bb7cd41e84e29af6f81b693502e1c02555fd74c2de19648633d3ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8390 5040 bytes
font_01_sfnt_off000094b8.bin
742beb38823187d87a36eac0d0de2fdb4aa7912fe021d04cf58400a5d31abe0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x94B8 10456 bytes