Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b94cb32d4220ea…

MALICIOUS

PDF

82.7 KB Created: 2020-10-31 01:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 66f65803aabf9ccd01fd37bea6e5cf9a SHA-1: 3233542cef51b93e2cdefacfec467cb8dc478be9 SHA-256: a5b94cb32d4220ea134931825f90854dbe2ec4903564d3717841796362730abe
134 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, specifically designed to lure users with a fake "repair manual" to a malicious URL. The embedded URL https://cctraff.ru/strik?keyword=gamo+air+rifle+repair+manual is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://cctraff.ru/strik?keyword=gamo+air+rifle+repair+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f8ed7e441d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_5f9b03450e085.pdfIn PDF document text
    • http://www.opentle.orgIn 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/1/0461/8122/0505/files/serengeti_eyewear_south_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3390/2247/files/jalar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0432/7598/files/gedazigomexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b66288-1269-4821-a5f7-2c6429a0e4fb/84164976872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5778/9108/files/lyrics_to_king_for_a_day_faith_no_more.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/kenmore_series_500_auto_load_sensing_washer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9951/0678/files/fodiralalunebopesatutapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7810/5250/files/53269763361.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000edb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEDB3 15808 bytes
SHA-256: 69863320215c4024efcc74eb8f9634b730498bf9371a18723994e9d67b470a4e
font_00_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 4900 bytes
SHA-256: ace369fc4fef650f94e67b59132b2aa0f43f8a3435e9df0301d6bcf60ba0e7e4
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10944 bytes
SHA-256: fc8cc9e2b77298fadce15b45499c1367ac2b8c1b078fb6c7e7de0af084679802