Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b85b6901d6b3fe…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 07:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f3e73489e474c5bc6e07dc6da67898 SHA-1: 24288e1615c2db467595841fe89047a478df32be SHA-256: f1b85b6901d6b3fe58353d89d74c61e46c08925a38e040be92d8c56a8c1275e4
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, disguised with a lure related to an iPhone restore error. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the presence of the URL in the document body strongly indicate a phishing attempt. The PDF_SEO_LINK_FARM heuristic suggests this PDF is part of a larger link farm operation, likely for SEO poisoning or distributing malicious content.

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/wix?keyword=iphone+could+not+be+restored+error+4013
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/samuel_beckett_molloy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/assimilation_in_phonology.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/xinelopeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/jefagibipusasi.pdf
    • https://static.usrfiles.com/ugd/ade4e6_e0b539c75c6f47e3ba5179daa9c7984b.pdf
    • https://cdn.shopify.com/s/files/1/0432/7486/2758/files/interview_with_the_vampire_script.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2735/files/health_certificate_usda-_aphis_7001_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/43992633287.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/vidulinigisina.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/sifekonige.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/21573639307.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_off00005866.bin
50dab73beff5e6c290e22536d62915b291da921651093a2938197e75a9285c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5866 5476 bytes
font_01_sfnt_off00006af5.bin
c3a96ade221988189affe84d18355d919ef8697506e30e4fb388e9dbd354e436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 10240 bytes

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