Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ec650088890e56…

MALICIOUS

PDF

70.6 KB Created: 2020-10-30 05:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7e5208ad8177267c77f5598bf802f30e SHA-1: 2685dbb69aa612f7a77892362d86c16853e2f2de SHA-256: 30ec650088890e56ac506d74e659c8e1e4fdde75d4d49b2cde6c0027ee5e2b91
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with SEO spam and phishing lures. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a fake guide.

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://ttraff.ru/123?keyword=imbd+parents+guide+total+drama In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5f9b40b4cc7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f9a13847ae36.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/xidulumexi/dirty_text_messages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4522/2062/files/lenovo_t470_specs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/pitiritovazebiza.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/juvofunitowefazugit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9508/0135/files/fawolovudur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/gewuvexezukexolefaduvote.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/download_materi_biologi_sma_kelas_x.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/abuta_grandifolia.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/lokivadupoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/dasasolaririmuwep.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/download_candy_crush_soda_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4114/2968/files/13536954154.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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 5240 bytes
SHA-256: dc38a2aa3e28b101461bc6eb6532f51c2a10885889b602e8f1958f879e07eb91
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 11488 bytes
SHA-256: 6eb26f8ef112074f22eacde9c8b625efb8f2b4667dc95d307d5d42f43e20bb89
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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