Malicious PDF — malware analysis report

Static analysis result for SHA-256 31161f3fdd31c7b7…

MALICIOUS

PDF

74.4 KB Created: 2020-12-08 23:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: af068984d950bd325291736bd9e43020 SHA-1: b219f86c34276660a8a89064c8cbd6c83ebcb430 SHA-256: 31161f3fdd31c7b794331dde694ada06b9e39b766fa426ab235e4fd31ea10ade
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, many of which point to PDF documents, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL 'https://cctraff.ru/123?utm_term=appvn+apk+old+version', which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://cctraff.ru/123?utm_term=appvn+apk+old+version In PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/9074186.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/japoposigudapil_sawezozezet_tezijujap_gilow.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/1e3eff03.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/bc51063e1bef40.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/pezugix_jilevuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://static1.squarespace.com/static/5fc501b17d0c8f249d5b4547/t/5fc5c4f4145a8629dc797cb7/1606796533088/52190967200.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/beautyrest_recharge_world_class_vanderbilt_collection.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/sagetuwusufiximubonige.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1467f8cdb769c6ab16ce/1606292583847/14060489591.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dda31452f90b7fe53205/t/5fc2b6bb08845d0924e3043f/1606596283574/36580863050.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/gokafuluropo.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/95416423177.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 5068 bytes
SHA-256: a332526e280249871b3a7a20b9ec4cb52cc35db2d28e731a2b9028df94371522
font_01_sfnt_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 11604 bytes
SHA-256: d9b0c738d0fece21ac54c0170e0b39f19983db7dc1505af82f7589119339cb11
font_02_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 11116 bytes
SHA-256: a567b6b4141b28347f42def1695761ca37cf0ee5d2bd6371f0b96b671702f554

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