Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a015c45a720f55…

MALICIOUS

PDF

47.3 KB Created: 2020-07-18 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cdf01667fd84b8a0ff85f1d32ae0667 SHA-1: 388098f906afe9d43c70ea120e0692632cb4c700 SHA-256: 45a015c45a720f55482058386580a7a51f1b72a8974354b9f0638c32271fbfe2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains numerous links designed to redirect users to external websites, a technique often used for SEO spam or to distribute malware. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'analog circuits basics pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The presence of multiple PDF link farms further supports the malicious redirection pattern.

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.com/wb?keyword=analog%20circuits%20basics%20pdf
    • http://files.employmentcollaborative.com/uploads/1/3/1/4/131437041/gatulusor_gitus_liludazizod_dodati.pdf
    • http://files.stopanddecide.com/uploads/1/3/0/7/130738723/wogawurujo.pdf
    • http://files.wildphlowerwellness.com/uploads/1/3/0/7/130738806/5406314.pdf
    • http://files.access-genie.com/uploads/1/3/2/8/132814967/lelaxikenafigevulo.pdf
    • http://files.captivatingcriminalitynetwork.net/uploads/1/3/0/9/130969704/ximorepelutulon.pdf
    • http://files.be-psychology.com.au/uploads/1/3/1/4/131453522/4a9c8f1.pdf
    • http://files.capt
    • https://zefumonale.files.wordpress.com/2020/07/27657633699.pdf
    • https://pimuzuvaduz.files.wordpress.com/2020/06/xovenikixupitanibuw.pdf
    • https://ximufowug.files.wordpress.com/2020/07/19215781268.pdf
    • https://kudivex.files.wordpress.com/2020/07/99203126787.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/18403032933.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/fugelujigedetumeni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9963/6390/files/ramogojizajamonevipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/7580989252.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/56069237182.pdf
    • https://cdn.shopify.com/s/files/1/0434/3008/4760/files/darezamamaresibopajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/ratidajaguxujixifuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/56686822524.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_off00007286.bin
7ace216863c7ef30ca60eddd246502c39baa49a03b79655a42a6d1dc202ae7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7286 5216 bytes
font_01_sfnt_off0000843e.bin
7143c208bc370a5a9137567666efa8cfce388cd13d3179fa577a523ad36f0c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843E 14296 bytes

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