Malicious PDF — malware analysis report

Static analysis result for SHA-256 9458944468c40f34…

MALICIOUS

PDF

51.5 KB Created: 2020-10-26 00:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b80c56cc48fc304414bcd501f3b8e81 SHA-1: 3683d4a038c841e2fc9870fbec4f9fa57b019aa8 SHA-256: 9458944468c40f3411c00abd75d891dddd79192091a595a5d6fd65c046a3575f
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector URL (https://ggtraff.ru/aws?keyword=chopin+ballade+in+g+minor+op+23+no+1+pdf), indicating a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm it acts as a redirector and link farm. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/aws?keyword=chopin+ballade+in+g+minor+op+23+no+1+pdf In PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/mikub-zezojumuligu-lejune-lagawisip.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/dekotubij-vovupoxo.pdfIn 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/1/0477/1489/3980/files/rusonoxasoxekeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5000/3363/files/thompson_brook_school_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4116/3926/files/washi_tape_holder_michaels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7517/5335/files/gijaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8233/4883/files/navufetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/oxford_word_skills_advanced.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/52061306320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9737/5388/files/salamat_full_song_wapking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adc7082-d90b-4769-af73-31e6b5636542/tonibadexute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4de45a9-762d-46ca-a144-e92d76c134b9/23720003821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48568464-b0b1-4abd-8d3f-f6878dc09ee5/39484120034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9bfcd8-0f0b-4851-b5b9-aa8c0b9c7845/xoziwukaxiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a839a4-a227-4fb3-976a-82f49d1516ec/gofinenerevulij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4013/2248/files/mass_effect_3_mission_order_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/linejisej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0302/5840/files/vegagukutulimufuriko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4083/2150/files/33706463464.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_off0000885e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x885E 5672 bytes
SHA-256: 8c194b97044db10bf55e718ca58539ecf9b8fea95d28d649d60b64bd90e64a8d
font_01_sfnt_off00009b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B74 11908 bytes
SHA-256: 7d64e8dcd716d1b85edb3307318b6359d256f55bbc3dfe1bbb2feace07cad24f