Malicious PDF — malware analysis report

Static analysis result for SHA-256 53525c448d5eadf9…

MALICIOUS

PDF

40.6 KB Created: 2020-11-02 09:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 152eb03f3f998e9a8d445a28766108b0 SHA-1: 2cb784e96e87c4e03adb21bdf9affd14ea2f13e9 SHA-256: 53525c448d5eadf93a8665e6e1bd286ffea808e0fc748c3c2d622e9e6c3f54cb
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?keyword=crack+apps+pc In PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/ff3ef9.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fejebo.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/viwowazigura_sabek_nipowuzivawu_wojujuwuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f9d32bb99354.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/4442999.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/somulimezopomab-nolapuxoduvamak.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/1/0430/5181/0969/files/cswip_3.1_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1441/2190/files/roger_federer_hat_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb566ba3-1e16-4e0d-a357-d028e99b0bf5/73711776079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/8940/9193/files/nazadivugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac75f97-08ff-4ce5-b2b0-01f03c335705/vebeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7498/5375/files/jamukiseseko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6101/7283/files/48260442770.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 4864 bytes
SHA-256: 4604dfd54a255c7917aec8542f9d6dff8270ace5273795a141535955edc2f72a
font_01_sfnt_off000070c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C7 10952 bytes
SHA-256: c51b737852066e73f4f783a4236816b0e01c272153d42636e512ec7599c1629b

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