Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ec33c3bd13507b…

MALICIOUS

PDF

54.7 KB Created: 2020-09-03 18:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 93b0befb49c4f115d8fcd7adf830e570 SHA-1: 184fd635145a726dd0dc49ef54901b4682881405 SHA-256: 81ec33c3bd13507b8664ec1c7f80be81645ae3445618cad7daf0bd21fed75df4
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=accelerator+apk+plus In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/f65518_54b1261c9f47493f840835bda46fe39b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/80c1db_4541fcb564ce426fb35e6ad19b51fcb6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_82d68c2fe8a948b0bf6390ae701f5144.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/07625c_4a36ff73d5a3417195bd8227285740dd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f63f29_1d40b3ba2c9e4d48931413afac029117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/71705677751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/kovavomakavibewupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/autodesk_electrical_symbols_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/wuvutafo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000095bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x95BD 24084 bytes
SHA-256: 90aab29bafaf9f4d241a843ffd84b304331fa52f2f45656d04da2957fb8072a7
font_00_sfnt_off000061b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B6 4708 bytes
SHA-256: 186ad2ef0d8b51a4fb880e6d04ff2e3f1531f5bbd4a7b015638a3fc3a6b2ef68
font_01_sfnt_off000071bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 10432 bytes
SHA-256: 25c73c96fe0c6e967484f087f49e95accfd16f870b7c24e3ef8b4c954f15d081
font_03_sfnt_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.