Malicious PDF — malware analysis report

Static analysis result for SHA-256 41804ef85c281325…

MALICIOUS

PDF

68.3 KB Created: 2020-10-31 03:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ffea58452d206ab25a05ba051e1bb3 SHA-1: 2d780e62103f29324fa3d581eb9a639828e61db6 SHA-256: 41804ef85c281325b15580246c0496291ed77073f1d0989ba199e26f57c1892f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous external links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. This suggests the primary purpose is to redirect users to potentially malicious content, likely for malware distribution or phishing.

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://cctraff.ru/aws?keyword=apk+and+obb+of+minecraft
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/942bead5.pdf
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8e2ad2c78d9.pdf
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f9065c9d3c1d.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/84353154.pdf
    • https:///www.minecraft.net/helpLEARN
    • https:///www.minecraft.net/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0266/8914/2968/files/fanagabibixena.pdf
    • https://s3.amazonaws.com/kudufigunabi/thx_moo_can_clg_wiki.pdf
    • https://s3.amazonaws.com/wonoti/loputiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/jipigujojawixizusemusevef.pdf
    • https://cdn.shopify.com/s/files/1/0496/5813/4685/files/35972511325.pdf
    • https://cdn.shopify.com/s/files/1/0496/0390/3655/files/silly_science_worksheet_answers.pdf
    • https://s3.amazonaws.com/luborinizu/android_games_hacks_apk.pdf
    • https://cdn.shopify.com/s/files/1/0503/5665/0144/files/mitel_phone_conference_call_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0496/2346/6135/files/serox.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a6.bin
e0bb4fac8b19b18d9efbecbe870453d9fa2466565b17240ee651a1a093ca4557
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 5284 bytes
font_01_sfnt_off0000c78c.bin
777b734c2b870edeba99815faf0fc84e1e43cb3dad528f02ce987807752c8ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 11556 bytes
font_02_sfnt_off0000eeec.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16092 bytes