Malicious PDF — malware analysis report

Static analysis result for SHA-256 275a44132b5ed047…

MALICIOUS

PDF

44.2 KB Created: 2020-11-04 15:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7d242f6e866ec19c5200f75eba49c65f SHA-1: 9126cf576b293e800acd723ad93c9bfd9f85ed24 SHA-256: 275a44132b5ed0473fc1cb338e19b75cf56d6f6cf3e29ce1d726db4bf79cd25d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a redirector URL, suggesting a phishing or scam attempt. The embedded content, though obfuscated, includes the redirector URL and references to inmate search, aligning with a lure for sensitive information or further malicious redirection. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.me/123?keyword=anderson+county+jail+inmate+search+tennessee In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_5fa0d11a10f81.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wewebunovemerifabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5f9b13ed4178e.pdfIn PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/gefuzetixivosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f9260a9464de.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/40e18a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f913ea49e9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5fa0bc827d6da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fefbfed7-8f3e-4710-9c03-ee0f98aa0f11/return_man_zombies_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/baraja_inglesa_para_imprimir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5228 bytes
SHA-256: ce4e546be0c1885660303c6ebd5623059a55273b87c73f052621c02d7a1c4708
font_01_sfnt_off000071e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E0 10500 bytes
SHA-256: d936a3268c296e08bd4a35b2b73c3db2e986fff8a1b7c700e7d768ab4f627424
font_02_sfnt_off000095e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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