Malicious PDF — malware analysis report

Static analysis result for SHA-256 8518d814c8965ffb…

MALICIOUS

PDF

40.6 KB Created: 2020-10-29 23:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1c96924ea1a6cae67f2dde08c1b0e30f SHA-1: 3b4f7f15e55a851ec08fa8b49bd367f1bcaa1487 SHA-256: 8518d814c8965ffba437d22276d5da277ad3041ec45aae796dbf527b5b9cda93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The document body, though heavily obfuscated, contains text suggesting a lure for a manual download. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=ilive+under+cabinet+radio+manual In PDF document text
    • https://jelafabonopavu.weebly.com/uploads/1/3/4/4/134443296/bavawirifugogeweg.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/7283398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/giwurode/bl2_shield_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6617/4871/files/dymo_letratag_manual_paper_jam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45980d3-1c31-4d1e-b663-c1b91d3cfd1e/cinnabon_cereal_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c2afc6-29e2-4c69-a404-f599584737fc/jamirulusa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/40990683484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17fddcb-6ea8-41e2-9ebb-c1f6b5168c2d/37417901316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0659/3696/files/good_health_market_quincy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9228/4070/files/concept_2_pm5_rower_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5827/3183/files/floyd_rose_special.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 5044 bytes
SHA-256: e80dec73808771dbe4327733d3a17d9c8a1f9317fee9ec45006e96ee2b5f5330
font_01_sfnt_off000071bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 11028 bytes
SHA-256: 71ccae8a36b8dd93763438f39e66eee7d92dbc0df02869034d22730a43a33e49