Malicious PDF — malware analysis report

Static analysis result for SHA-256 181966cd18dbf681…

MALICIOUS

PDF

47.7 KB Created: 2020-08-07 05:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b583b96a043ad01ee8a6e94a64578191 SHA-1: 82f5ce4ee19dcf2e4722964d1270acc84cb4db4f SHA-256: 181966cd18dbf681e48fc84f4798dde4f3fbaafadf6037a6b8307b8480fce4cd
194 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for free software tutorials, aiming to trick users into clicking the malicious link. The presence of multiple PDF links and a critical redirector link strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.com/pify?keyword=adobe+illustrator+cs3+tutorials+for+beginners+pdf+free+download
    • http://luvewer.curlyhorsevermont.com/uploads/1/3/0/7/130776131/vatunosogovudo.pdf
    • http://mexemegu.ifindoubttravel.com/uploads/1/3/0/7/130776728/6d9a2a77a4.pdf
    • http://files.furiousdaysk9.com/uploads/1/3/1/0/131070713/bae9a18ea0e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/bajudesixafilagiwovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/17115591180.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/65909772375.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/bevoroleloxuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/caso_clinico_absceso_hepatico_amebiano.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/91972745871.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/tracheostomy_complications.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/tivuboteme.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/72762298711.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/boxedotam.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e35.bin
8bbd8e1a96fa5ddb0f067b207a7f85a87b99df91bfb5cf9a280d9f15490ae98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 5588 bytes
font_01_sfnt_off00008148.bin
47756d12d5e11aa812159829a52e6e749299860114811321c0ee94d01ce2e70a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 9948 bytes
font_02_sfnt_off0000a33b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA33B 4324 bytes

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