Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a365471f6b3724…

MALICIOUS

PDF

71.7 KB Created: 2020-12-18 14:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 664e4bf95ddc579515942c6d338932fc SHA-1: 2f2cb9a3400b20abb2125bfb9540add706f374c3 SHA-256: 50a365471f6b3724bcb29a5be401ddc352883b52249bc8696382c62da066f991
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector, specifically designed to lure users with a fake free font download. The embedded URL `https://ggtraff.ru/123?utm_term=block+letters+font+dafont` is identified as a malicious redirector. This suggests the document's primary purpose is to lead the user to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ggtraff.ru/123?utm_term=block+letters+font+dafont In PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/b7b545d2f0a5ef1.pdfIn PDF document text
    • https://lumitagejul.weebly.com/uploads/1/3/4/8/134887152/b433eb19.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/6440041.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://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdc9daa398d112f3d7a1e53/1608293803434/sumofirajuzaduvosonepi.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/civil_engineering_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f60f0c0-ab1b-4b07-8d34-e670fd76fd87/vector_mechanics_for_engineers_11th_edition_buy.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1bd5803f460880cd497c/1606228951800/javozilumexubeveja.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc34462ab79f442f238dc9b/t/5fd61e16d654060362bf4249/1607867927275/commercial_agency_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e301474-cb60-4ea1-8aef-922e0b6f6a6b/throw_your_tooth_on_the_roof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa91e01-5091-42f5-b178-b00861fd25e5/76364795914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15538348-f28e-4814-a05e-48db06be47bd/narmada_ashtakam_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913a0635-2da0-4e37-b4a5-73b38b34b191/gopagenepobepuvakizuv.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 4868 bytes
SHA-256: 6ddb56a48041d8e7ec4336a3fd94afbe1f3726847ca82b0ac360e9ee493439c7
font_01_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 10324 bytes
SHA-256: 8326ebf7dd2ac9494df57606ea29738aa3b00556e70c71735ac7331bc71d10f3
font_02_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378