Malicious PDF — malware analysis report

Static analysis result for SHA-256 196668d941324da6…

MALICIOUS

PDF

43.2 KB Created: 2020-08-03 19:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 122cfaec6fa5f79760a98606638c0d3f SHA-1: 99783a53b2625e127afbe638eada98e47b30bb3a SHA-256: 196668d941324da6c9ba1348dc7cb342227a4c75ebc4ad61820819a9b6df7e5e
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs users to a known malicious redirector, 'ttraff.cc', which is likely used to distribute further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting an intent to lure users into clicking these links. The ML classifier also strongly indicated maliciousness.

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=alcanos+ramificados+ejercicios+pdf
    • http://files.kurtgreen.org/uploads/1/3/2/6/132683334/vufofisam.pdf
    • http://files.bindergenealogy.com/uploads/1/3/2/6/132696414/fogobabudanarak-zebojikages-butifeturinup-kuvomo.pdf
    • http://files.kerricoledesign.com/uploads/1/3/1/4/131437941/461158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2128194791.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/jetinamovomex.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/galikifonevodonedoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/tawaridi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/vesafofamaxiliretoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/css_center_image.pdf
    • https://cdn.shopify.com/s/files/1/0448/4546/5762/files/toefl_writing_topics.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/ruby_alphabetize_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7815/files/19260510689.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/bumewizesevedaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/dexiruxifijisix.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/19542519792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6820/2901/files/rejurawaxanogopab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de2.bin
b949538546ba567279211b53af8758eaef7a4dab1ea5adc93995d5d14a10e162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE2 5072 bytes
font_01_sfnt_off00006ef8.bin
52ccf5a010b35f89e8b4d44a8d34cf6344afeba52eee09cb5657fde3c8266067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF8 10212 bytes
font_02_sfnt_off0000901f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901F 4324 bytes

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