Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f841e427db6e8b…

MALICIOUS

PDF

45.1 KB Created: 2020-11-02 04:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7566ea949e5ce2e6b01fe25ffb180d3 SHA-1: e16486ad644a94743962330ca0cdaa81be986e6d SHA-256: 05f841e427db6e8b584a0a3ce954f8f0ef3fa42edf47e9980a341ec3f6dbf2bb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing attempt. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to 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.cc/123?keyword=miniclasix+baby+boy In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/1ddb399b5c54db.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/lexiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f9c6809b294d.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/bewanototaful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f89f3f55dfce.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/fudevimafez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/bojevokobagesugifadawil.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/monin_vs_torani_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/72014713826.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/kentucky_permit_test_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5575/9527/files/fepelibaxigavugoboz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/27779877.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_off000072e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 5012 bytes
SHA-256: f91bc04d414375eb7642d7341ead05d165c5ccd2a9794e2dfe7dc407ba14d5ab
font_01_sfnt_off0000841b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841B 10596 bytes
SHA-256: 98be1d466fcaad009f9ed3ecc2eb62cdda9539096e65dcc4ef2b4d3aa7ff165a

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