Malicious PDF — malware analysis report

Static analysis result for SHA-256 248dcbec6eb79383…

MALICIOUS

PDF

45.3 KB Created: 2020-11-07 03:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aa3f8580fd444ac9a43805a97289e891 SHA-1: 26276f2867d0c4e210afc8f037f4fe991302b7c7 SHA-256: 248dcbec6eb79383693abe9319c92569220d65614e44de6c0188fc6caafe01a0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://gettraff.ru/123?keyword=ustvnow+apk+cracked, which is likely used to deliver a payload or phish for credentials. The document body, though heavily obfuscated, contains references to cracked software and the malicious URL, reinforcing the phishing lure.

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.
  • 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.
  • 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://gettraff.ru/123?keyword=ustvnow+apk+cracked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5f9f2e4d1d27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f92685a89272.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/porikafomezapi_tadiwomivurote_vuruvenademugok_diniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8e33bf4129c.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/752fda2bb40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8759771aa92.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/mevemamosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f8c26db183f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/558da66c-e208-4222-9025-789ab3ef0e02/9005999388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e032ae51-eb4c-458f-8112-cda2681757a7/regarder_rampage_en_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc799a83-055b-43e2-99ff-43ad00a6977e/dedomuriwobato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e4ceaa-68f4-4094-a332-10a4e3d6ae4a/siwepidisamizug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1cc047-e04c-4144-960c-8b332eabfbca/pezodifasesivefawem.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_off00006898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 5240 bytes
SHA-256: 9a519e86e1e6bf9a785add95a19a41dece6fd01ab9a366841dbca8ab9ce9f911
font_01_sfnt_off00007a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8F 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000831d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831D 10724 bytes
SHA-256: b264a03d9de8cbc7e5ceeb20298f91c7b1f6910e1d3050540b3bbf016bc0affc

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