Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed8ff3e81291136…

MALICIOUS

PDF

54.8 KB Created: 2020-09-06 17:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0d2c340b3eab00636b7ae6720d01b2 SHA-1: a0a697d6110ca1f43721a0c70a923c838aa3bf74 SHA-256: 3ed8ff3e81291136a4b6c1316db393319c684b731d097415b66de7d673451f77
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the URL for a malicious redirector, suggesting a phishing or social engineering lure. The primary purpose seems to be directing users to malicious infrastructure via a link farm.

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.me/wix?keyword=guide+to+speak+english+fluently+pdf
    • https://static.usrfiles.com/ugd/f0b6b3_4d6baf47f8bc4eb1b9aae83a807d4354.pdf
    • https://static.usrfiles.com/ugd/ae059d_f28aa99a1f1740c88f8e65282eecec55.pdf
    • https://static.usrfiles.com/ugd/b65acf_b756e4c5e5d04cea913cca0d1fee5fee.pdf
    • https://static.usrfiles.com/ugd/9c8fb9_cde3208497874793a2af8da3966ac80c.pdf
    • https://static.usrfiles.com/ugd/b8c837_869ea1663a48477aac062d4ac3bcb323.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/android_10_oneplus_7_pro_t_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/19370497360.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_bb4d37f86b424fdc9630f030fa3161e2.pdf
    • https://static.usrfiles.com/ugd/35e1ce_7823493ea6684444a2ee174866b0a5cc.pdf
    • https://static.usrfiles.com/ugd/7d21c0_6b0fff1679fb4119a25eb6123e670032.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_d7d5627a45f44e0889c4f55b65220883.pdf
    • https://static.usrfiles.com/ugd/4cd51e_32cb57e0b57247e98efa1e714bbe50ac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a50.bin
e3dd98f70aa857ed51a4f6cc058668e3763538ae36e3d292b579a94206684c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A50 5284 bytes
font_01_sfnt_off00009c56.bin
0a4e20f7de520d2778141185a90d08e095738430113c4cfaf26835e69a0e0934
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C56 10468 bytes
font_02_sfnt_off0000c025.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 4324 bytes