Malicious PDF — malware analysis report

Static analysis result for SHA-256 771d40c0dc284e3e…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f385b9be82eb7fd913c9db11100c4079 SHA-1: 10cbd8ee1f2ceb4a6b72a7b4940ff56c8036d445 SHA-256: 771d40c0dc284e3e5e667b560b6bc36687229a3a85ce0da847e3e4efb32f84fe
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are SEO-optimized redirectors pointing to a malicious domain. The document body, though heavily obfuscated, contains a clear reference to 'ncert biology class 12 notes pdf free download' and the malicious URL 'https://ttraff.ru/pify?keyword=ncert+biology+class+12+notes+pdf+free+download', indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=ncert+biology+class+12+notes+pdf+free+download In PDF document text
    • http://files.sydneybroadaway.com/uploads/1/3/1/8/131872087/e029277647ee.pdfIn PDF document text
    • http://files.evolutiondance.ca/uploads/1/3/0/7/130775518/papakejifem-gaviri-fefifiruta-lovuru.pdfIn PDF document text
    • http://files.soeasyofficial.com/uploads/1/3/0/8/130874524/f1fa3.pdfIn PDF document text
    • http://dowejosa.lagrangebennac.com/uploads/1/3/1/3/131384401/rumijotov_lutom.pdfIn PDF document text
    • http://files.hydrologicsportfishing.com/uploads/1/3/2/6/132680986/5411417.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/50870977522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/53053139884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/54466525515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/transformers_rescue_bots_season_4_episode_26.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/pcsx2_cheats_pnach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9521/9623/files/kovavusuzopisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/rixubawax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/45517144143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/nivuzomovujoji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E58 5600 bytes
SHA-256: 98b134cf0f76b99ef1e834dc60d4d6b7712b65e31630b6c5938f197ad0287608
font_01_sfnt_off00007188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 10448 bytes
SHA-256: 05b418425aed589d8de36ce155d0edfe44cb51efa56c3551391daa1842437f2f
font_02_sfnt_off00009547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off0000a348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA348 3060 bytes
SHA-256: bb965ea0515e7499bb47638dd5c820c8824ea93d586ac0d8f4a8f758a0d32bc6