Malicious PDF — malware analysis report

Static analysis result for SHA-256 4beb02e390661eaa…

MALICIOUS

PDF

47.6 KB Created: 2020-08-18 13:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165b0908839366752ea436f4d3cce98a SHA-1: 59e8be441400ef0f71e81e81256939335c4d66fa SHA-256: 4beb02e390661eaa9edec508eca3a78320f684640691147741c5f62a4b1c7308
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=scatter+plot+and+regression+line+worksheet, is identified as a malicious redirector. The document body, though partially corrupted, also contains this malicious URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=scatter+plot+and+regression+line+worksheet
    • http://ropaw.littleleaders.com/uploads/1/3/1/4/131437252/8463347.pdf
    • http://xokexusug.thefrostedcookiebakeshop.com/uploads/1/3/1/1/131163635/448fb345e.pdf
    • http://gufema.2cvtv.co.uk/uploads/1/3/1/6/131606758/pefesujef.pdf
    • http://jopenut.jasonfranklin55.com/uploads/1/3/1/3/131398097/9840541.pdf
    • http://files.karlasthoughts.net/uploads/1/3/1/3/131379552/popazonuzevuzarofav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/93263520970.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/15814364500.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/98305478620.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/mass_of_light_lenten_gospel_acclamation.pdf
    • https://cdn.shopify.com/s/files/1/0434/9054/1728/files/alimentacion_balanceada_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/mizejagumu.pdf
    • https://cdn.shopify.com/s/files/1/0447/0921/6409/files/demonstratives_in_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/pugiza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/2699722972.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/algebra_de_boole_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3362/files/37155731333.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/tanusepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/41128753497.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006333.bin
cafc66053d53eb8e3277a25bdee2e7701b17d43b20e552da9cba7d884a1a5f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6333 1964 bytes
font_01_sfnt_off00006c81.bin
26377f2d77c69e9f9a939db17fa6530e76a24e1d3f1c5d10099576254b8cb4c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C81 5380 bytes
font_02_sfnt_off00007ec0.bin
737985c92621b6132663f5d84010fb56f4b9479ee0e2b05a56cec6c98eb48bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC0 10464 bytes
font_03_sfnt_off0000a277.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA277 4324 bytes

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