Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a8e5b3767a7f44…

MALICIOUS

PDF

41.6 KB Created: 2020-08-05 18:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5360fde4f72bae17f4f367c43759d48 SHA-1: 4fe4ba3fe3703230c700c868ea16b90310e9adc5 SHA-256: 16a8e5b3767a7f44b5566287fc13eea54f6ed0341480e674a71aa51d3e72bcd7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites for phishing or malware download.

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.com/pify?keyword=aneurisma+a%25C3%25B3rtico+toracico+pdf
    • http://files.travelmail4pam.com/uploads/1/3/1/8/131871786/5302310.pdf
    • http://files.scbailacademy.com/uploads/1/3/1/4/131437671/5953042.pdf
    • http://jumevoji.gpbballstore.net/uploads/1/3/1/0/131070152/931369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/tracker._pirateparty._gr_6969_announce.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/past_tense_vs_present_tense.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9361/files/96145940043.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/48646118828.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/jekugewodepigomigunan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/51241524098.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/56152348416.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/59805892794.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1273/files/13327113565.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/49604613451.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/67714963093.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kirojaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/ludisusuzomuxizivonuzar.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_off00006179.bin
a7bb77dfbdc6a6ab9faaa53ceba61e530e1f88f2752d267197ec211a5b6d03dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 5392 bytes
font_01_sfnt_off00007379.bin
f3ae9071c6da495e4c5133641b8ad0ef22ff27cc1f578610d20ccb3b9e0ab27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7379 11240 bytes