Malicious PDF — malware analysis report

Static analysis result for SHA-256 172bdc67f388dac6…

MALICIOUS

PDF

93.2 KB Created: 2020-09-05 06:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581b1d7d2adf7122839172792968c373 SHA-1: 02ce940f8243d07361d0b7eb402fae3be435bc17 SHA-256: 172bdc67f388dac626e25b35e5db1d8a9c58bf02580199c09bd7af77f5cf46b0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content.

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.ru/pify?keyword=publicly+traded+companies+financial+reports
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8127dd_9818a88551424ad29ec9fbc6ac06d8de.pdf
    • https://static.usrfiles.com/ugd/f90bad_9ba70447b2c045fd9d74a9af8bf841c1.pdf
    • https://static.usrfiles.com/ugd/30ea26_d6567111c9df4c9b9da01e53cd3398a2.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/lujasademexotiwel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/advantages_and_disadvantages_of_intensive_reading.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/school_coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/amman_movie_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/drastic_ds_emulator_apk_onhax.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/82542746780.pdf
    • https://cdn.shopify.com/s/files/1/0462/5730/7797/files/75962689875.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/character_animation_books.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_off0001247b.bin
302cb791e4f81a9f6e21be1755c4d3e21f7426c44cb4804ed91297dc2d60c28b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 5544 bytes
font_01_sfnt_off00013744.bin
c1069d2abfaaef8af4948fd367ea95071287d2893eb2237f7f0b294146099210
pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 15544 bytes