Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d096ad4f4624eee…

MALICIOUS

PDF

46.3 KB Created: 2020-08-29 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff0d3ed4389bba2adb806537c691d06 SHA-1: 0e7d711db3df22895244e713b9ee85e46915b9e2 SHA-256: 8d096ad4f4624eeeb32986cf869a026cfbe093d2fdf16894aa6c73f228d18d8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link within the document.

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/wix?keyword=cold+noses+at+the+pearly+gates
    • https://static.usrfiles.com/ugd/b8c837_9aa87b3a407b411b992e3fae46b32f23.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_4c7d70f9b19d46ffbb3d4ba8e02e4390.pdf
    • https://static.usrfiles.com/ugd/73cb9e_a9055221429b42589b455f645f68f557.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0412d6663414fa8aff2bbdb051e9225.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d4867ac1f04469b83472b97fd8454e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/algebraic_expressions_for_class_6_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/food_matters_holly_bauer_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/womiwerojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0447/4968/4885/files/basics_of_model_aircraft_design.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/78797803521.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/56198372107.pdf
    • https://cdn.shopify.com/s/files/1/0447/2533/8265/files/anime_anatomy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/34861864586.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/46632570206.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b3.bin
5a8577cb603bab3ed231124c3e8f8f0e68d6fe770992c7649a9bbd60429637f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B3 5228 bytes
font_01_sfnt_off0000897a.bin
11db7a9063cbdf886d3afee9f8f3ceb2de4ef0eb205dfe0738bc07230d0741ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 10332 bytes