Malicious PDF — malware analysis report

Static analysis result for SHA-256 15da761d3680cdc1…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 05:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 555154b4c432f2d4e8eebc67e5efe43f SHA-1: 7e96bd02ab1e63767b40c7498bdf8d29af074424 SHA-256: 15da761d3680cdc1e5af9f8ab64ae8e2a1436e0e603df9a0043a54c2bd8ad143
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, functioning as a link farm. One of the primary links redirects to `https://ttraff.ru/wix?keyword=fundamentos+de+ingenieria+economica+gabriel+baca+urbina`, which is flagged as malicious redirector infrastructure. The document body is heavily obfuscated and contains what appears to be a URL, but the primary malicious activity is the extensive link farm designed to lead users to potentially harmful sites.

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/wix?keyword=fundamentos+de+ingenieria+economica+gabriel+baca+urbina
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/76228792734.pdf
    • https://cdn.shopify.com/s/files/1/0463/2500/6497/files/air_penguin_origin_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8568/files/6693564630.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/drivers_manual_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0435/6738/2687/files/biomechanics_and_analysis_of_running_gait.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/canon_mf3010_printer_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/31810308570.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/fur_elise_piano_easy_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/bosusivarufitawixo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/psychology_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/chalmers_johnson_blowback.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/36663260704.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://bit.ly/3bLY1J
    • 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_off00005e44.bin
a8205003953abaf5662b673d47d019ba76283580790961f2ae2275dbb2e4744c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 5352 bytes
font_01_sfnt_off00007059.bin
4bcd39bce16dce8da97b8d764fdf5d1a855153ec8e3179e82b8988257f162a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 12068 bytes