Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637c3770728ab3d…

MALICIOUS

PDF

40.4 KB Created: 2020-09-06 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1006f44d468bc1e576a2384712deb0cb SHA-1: f3f71b1b887246621aed3e26c577785841314133 SHA-256: e637c3770728ab3d54ee1a6401ad325b2f89d396ad4c82201822c536f23cb5fb
152 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Cisco vpn client 4.9 mac' and embeds a link to a known malicious redirector at 'https://ttraff.club/wix?keyword=cisco+vpn+client+4.+9+mac'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to various PDF files, likely for SEO manipulation or to obscure malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=cisco+vpn+client+4.+9+mac
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/antenatal_diet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3687/files/gogumibewidoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/2653/7883/files/zesazobapumunufukawene.pdf
    • https://static.usrfiles.com/ugd/0a0016_6017b9990f67446aa44527fbfd86fb0b.pdf
    • https://static.usrfiles.com/ugd/67f5f7_30d6087a20684699b3a1d2413f62201d.pdf
    • https://static.usrfiles.com/ugd/6a7407_b0a9d6f5f3604e998871eb3d6b0702cb.pdf
    • https://static.usrfiles.com/ugd/ebc5f9_50a25ddc99544f35afe4ff11eaf5ff16.pdf
    • https://static.usrfiles.com/ugd/9c66ff_73881b2e4f294bedbe8393b4cf734f49.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9515/files/lixorazudukurejimimerox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://static.usrfiles.com/ugd/856cea_d50f9a68120545e39a65b15303a875f3.pdf
    • https://static.usrfiles.com/ugd/681527_7fa222223333422eb8eabac9ad80e814.pdf
    • https://static.usrfiles.com/ugd/b65acf_3df8c159fff04f13be74148f6221a612.pdf
    • https://static.usrfiles.com/ugd/191a6d_fb9f4de8177f47c48726c450c08abc68.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_off00005e24.bin
e0d5a01f36bb79a6c97404ec21d7b3ba462f77134ddaf453a84283c2ff92edfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E24 5224 bytes
font_01_sfnt_off00006feb.bin
303eaa02dde3afd3988538bdfc69336d353b5743e854fc4c231b21b51a2dc128
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEB 11208 bytes