Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec19b062c5a2ba79…

MALICIOUS

PDF

45.6 KB Created: 2020-08-08 20:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c63cf32ef4203caa04a3e8c2f6d02f3 SHA-1: 2bc6071ff8a853641ce07740c4cabcefdfd69638 SHA-256: ec19b062c5a2ba7997dacfc1fa6c6ba099eebd98aed8fe918c4863cc68e57f0b
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download a PDF, but the primary link leads to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to Shopify, indicates a link farm for SEO manipulation, likely to obscure the malicious redirector.

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/pify?keyword=sweater+design+in+plain+english+pdf
    • http://dikakos.annemcallisterart.co.uk/uploads/1/3/1/3/131383444/nafiriri.pdf
    • http://files.bibs2bags.com/uploads/1/3/1/4/131437005/gibixupulamakaj_lawimadi_regufiw_zukubu.pdf
    • http://files.v-list.org/uploads/1/3/2/8/132815220/4946318.pdf
    • http://naralab.fineartfinewinefair.com/uploads/1/3/0/7/130738799/7010139.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/list_of_car_manufacturers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/wekizabelakogujisubazako.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/tfc_agronomie.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/nasegulamapokotasuwero.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/36508465137.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/gixixiposiwilamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/lelilupelexutepopoxinodaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/wumunud.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/monomefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/72873831139.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/79169167261.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b2.bin
a3790fd1a3ac15433d7721884842ce17883fcb5fa0008f2f6cd77a5514291bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 5176 bytes
font_01_sfnt_off00007743.bin
029acd90a133aae116ebb55710a619ad166f241430afa02428ac485b277a2a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7743 10600 bytes
font_02_sfnt_off00009b7c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7C 4324 bytes

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