Malicious PDF — malware analysis report

Static analysis result for SHA-256 651d383b6fb53a6f…

MALICIOUS

PDF

37.4 KB Created: 2020-09-18 05:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b747574b9ce5edc5086805e5238d055c SHA-1: c1da128f27ffc6746969199fc324b6abe8f77fba SHA-256: 651d383b6fb53a6f1cec099779bf19c616920da8808f3093db80a9e3243fcd0c
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 link farms and a known malicious redirector. The document body, though heavily obfuscated, contains a URL that leads to a malicious redirector. The primary purpose appears to be directing users to malicious infrastructure through a link farm, likely for phishing or malware distribution.

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.club/wix?keyword=nouns+that+start+with+co
    • http://files.fredfredas.com/uploads/1/3/1/4/131438337/50314eb9954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c579d892-f995-49d6-a166-7d1804fb8d94.filesusr.com/ugd/5b1e3c_2e44f4b2e34c493f8a79d7974270a5a1.pdf?index=true
    • https://37c99df9-b833-44ff-940d-9a6e331d2eb8.filesusr.com/ugd/90423f_31047b0788f94c4286374106ffa19578.pdf?index=true
    • https://bf7baaa0-5a52-4bd7-959e-c80e38521d86.filesusr.com/ugd/6166c9_d280f340d31c41d3bb2bb88ba307d6f3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/semantic_feature_analysis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/ansible_windows_from_s3.pdf
    • https://cdn.shopify.com/s/files/1/0482/0241/6285/files/dbt_skills_training_manual_handouts_and_worksheets.pdf
    • https://37b6c95f-73d7-46e9-9653-b0e2524896a8.filesusr.com/ugd/576447_6bbf6c7883474d64b046da9f7acdac72.pdf?index=true
    • https://0ef1ef23-c463-4862-87a6-c640822de4d9.filesusr.com/ugd/665c20_79a1188c829044ec993971070c18e9ba.pdf?index=true
    • https://b38e1218-8bdb-4391-995f-e8feccdd1c41.filesusr.com/ugd/1e557c_d0da3b7e2cdd49f5b054eb793be583a0.pdf?index=true
    • 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_off00005adb.bin
c9069392e6bd0d21c16a92fbcae83904bbc2cdfd30fca5c6b4c75495822c197b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADB 4916 bytes
font_01_sfnt_off00006ba7.bin
6dde1fb27f26ee7aef92bdf48834eae86fdeedb36e42c3b956ef4f60bcde08e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 8584 bytes