Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24bd491858031be…

MALICIOUS

PDF

69.3 KB Created: 2020-08-20 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9853eb7e65547b1c3f64124ef38646 SHA-1: 3688fc8d88f98a45d1dbe312a0760eceee38abac SHA-256: f24bd491858031bee531daa8bc7a319e7d4aa127a017d97d1c9ba4de1cd514d3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.001 Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded links that are part of a link farm, with one specific URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and other URLs hosted on Shopify, suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/pify?keyword=singer+chotelal+nagpuri+song+2019
    • http://files.thirtynfree.com/uploads/1/3/0/7/130776263/zafixikubawu_kupekuluveruxo_bipikodezaforiz.pdf
    • http://xajipori.noyeslibraryfoundation.org/uploads/1/3/1/3/131383483/b2e7a4fff69cb.pdf
    • http://files.metalsculpture333.com/uploads/1/3/1/4/131407655/godutukum_dopikigefi_direponogifosu.pdf
    • http://files.biblereadingmarathon.org/uploads/1/3/0/7/130739564/3f146005cfb1ab.pdf
    • http://files.allcomersmusic.org/uploads/1/3/1/4/131408103/43c2182d5883afe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/xofivabuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/9860/3669/files/zofogevajusajikitudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0503/2086/files/17258531541.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/56569889610.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/xixogud.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/jolararakovajalikorafejiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/principle_of_macroeconomics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/niv_audio_bible_old_testament.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/types_of_descriptive_text.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b1.bin
cfc83b27f456c4ae13dfab24830332934f4f97c6b681b6f208a1a6cf779d281b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B1 5660 bytes
font_01_sfnt_off000078de.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DE 3720 bytes
font_02_sfnt_off00008439.bin
3b51babb0644149b3819e36a770c4b8bf09b1ee5a3f0db78f8e6d05be109d4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8439 4916 bytes
font_03_sfnt_off000096ef.bin
03312f05312871ae00fca0aa60d8e90e1c5990039db8af492e3137daddbd7a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EF 15560 bytes
font_04_sfnt_off0000c697.bin
bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 16080 bytes
font_05_sfnt_off0000db59.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 4324 bytes
font_06_sfnt_off0000e95a.bin
529541a2aa194367379c32af811664d6339417e6a1cf93b5412aea3080499860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 8904 bytes

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