Malicious PDF — malware analysis report

Static analysis result for SHA-256 4766652736f51352…

MALICIOUS

PDF

75.3 KB Created: 2020-11-14 02:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1819162cc2df99be47d2885b43ff1745 SHA-1: 1575371bd3ee202caac4d7b1ea8e67d7a1b51e90 SHA-256: 4766652736f513522db6efe3e25d589d9efe99dda0f271d5df514522904290c5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=questions+and+answers+on+truncation+error'. This URL is known to be associated with malicious activity. The ML classifier also strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=questions+and+answers+on+truncation+error In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5faa30eddafc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f9c301d5a1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_5fa89f24ee8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa09cb56ea4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5faefb10351ba.pdfIn PDF document text
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/ruxapewave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f90e18e194cc.pdfIn PDF document text
    • https://kuvetofuba.weebly.com/uploads/1/3/4/6/134607492/75dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f8bff412b374.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://s3.amazonaws.com/mudurixo/bankers_adda_computer_capsule_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/xegifabi.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/mk_games_host.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/65763958654.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/steamboats_mississippi_river_1800s.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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 4936 bytes
SHA-256: 8415b2cb46aa6bbf31331e45f032f6a76f5f1c4d3d5f3bc09f655da59317cf7f
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10688 bytes
SHA-256: ea1c62241afc1808f8487759898f02d4860803f98887ba4fbed3cec384f8251a
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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