Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b8bae9768860bf…

MALICIOUS

PDF

42.8 KB Created: 2020-08-29 08:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144f073cb8d19d801acfc22ca8c44177 SHA-1: 644871b00c421d603b118645bc027093006269fd SHA-256: a5b8bae9768860bf1f496902928fb2dc0af2a46cfc305181d5ab0b5b9740587d
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to benign Shopify domains but one critical redirector. The document body, though heavily obfuscated, contains the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link.

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.cc/wix?keyword=activemqconnectionfactory+properties+spring
    • https://static.usrfiles.com/ugd/b8c837_baae0ff5563447b0846508726b71a5b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2611dc6242dd45be8fba7aff5a1e0f95.pdf
    • https://static.usrfiles.com/ugd/b8c837_3558ca53279742199c2159c93711a0ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_aca808a4b24543d299a287e11c2d2129.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/55081350676.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/14525783740.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1445/files/nivelinugiwede.pdf
    • https://cdn.shopify.com/s/files/1/0447/8933/4177/files/batch_script_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/mother_mary_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0469/4913/8593/files/26334072686.pdf
    • https://cdn.shopify.com/s/files/1/0431/7206/9525/files/76265594062.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/42379755004.pdf
    • https://cdn.shopify.com/s/files/1/0432/5346/5243/files/9149952444.pdf
    • https://cdn.shopify.com/s/files/1/0432/8275/9836/files/55747809628.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/81274271999.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_off00005f0d.bin
6cf097d10fc2d4842f5c66a24512a49a43f3a63038f2df68ebaddd44a4fb9278
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 5580 bytes
font_01_sfnt_off000071fd.bin
ffbfa76a585b4e9160c87203e4d89554acb859ebdd8fd1aeb333a2659d7b7002
pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 14400 bytes