Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83a528a3577b78d…

MALICIOUS

PDF

66.2 KB Created: 2020-08-17 11:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d8e0f700da08e9873b3f1eb241a39c0 SHA-1: dc7b71f4ca48dc03d7884a4af35844c8c008e6a9 SHA-256: b83a528a3577b78d9c528d726a0e8be6207828e91bcac07543fc72f10c5af182
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing for a link to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring the user to click on the malicious link, which is likely part of a phishing or malware distribution scheme.

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=capabilities+android+appium
    • http://bexopujat.shishisalon.net/uploads/1/3/0/8/130873995/6555705.pdf
    • http://files.ritterelementaryschool.com/uploads/1/3/1/4/131408250/zamavexinoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/43335414526.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/jopevofaxinuziluwegezav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5242/4598/files/vamokonos.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5871/files/buddhism_founder.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/76756619324.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/binakexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/pividifuvasudasowu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/48884179081.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/page_intentionally_left_blank.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/digafi.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_off0000bfd3.bin
e6015831ddffde30a2f2478ecf80920d1591d3d4c278a76e86721f209ee25403
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 5148 bytes
font_01_sfnt_off0000d129.bin
923238f5068a29770f7dd4d90b5cb47f229690f391962e84d0f7be8ad6a21d21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 13220 bytes