Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7712482d3879974…

MALICIOUS

PDF

31.7 KB Created: 2020-11-03 00:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6bd0096254d9e025a25f05a1de4f1909 SHA-1: 70d24c724e18dd2c2c1d35ba8a363f54ecbea652 SHA-256: b7712482d38799741671dd3bb62bc17db422b2c218001b351d64847ef90fbdfc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that are identified as malicious redirectors and part of a link farm. The document body, though obfuscated, contains a URL that appears to be a lure for a Dell manual, likely intended to trick users into clicking through to a malicious site. The ML classifier strongly indicates maliciousness.

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.link/123?keyword=dell+inspiron+24+3000+series+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f88f9ff095a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f9290011bec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fa083d2d7535.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/c9863cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8e4180e27bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f8daeb2da31f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5f9cdd4146278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f9e76e88e316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8a0516cabca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_5fa08b0d58cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2235/0000/files/kannada_prabha_news_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8040/0030/files/twilight_life_and_death_google_drive.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000040c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40C2 5492 bytes
SHA-256: 283b6658f3c94361008cb7d8b3afe3c8d41ec5aaca9e2e75f0754e233534532e
font_01_sfnt_off0000535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 9036 bytes
SHA-256: eb8158c50c514c3ac24dfa9fbb885ffead2d78ed2fbf9f6ba9b0f72ad7fb05be

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