Malicious PDF — malware analysis report

Static analysis result for SHA-256 290df17402b3dd46…

MALICIOUS

PDF

44.1 KB Created: 2020-07-16 16:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 77266395e0bdf5ff239de0b6b01656ac SHA-1: 3417da7f7f9e3dc3840affbc3ed40aead312c9db SHA-256: 290df17402b3dd46ee551fd5460bb017b5234c1e91f79d5dbd7dcf9afe971a9e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. One of the embedded links, 'https://ttraff.cc/wb?keyword=classroom%20rules%20and%20expectations%20pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'classroom rules and expectations'.

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.cc/wb?keyword=classroom%20rules%20and%20expectations%20pdf In PDF document text
    • http://files.slowgrindfever.com/uploads/1/3/0/7/130740363/tokimoz.pdfIn PDF document text
    • http://files.mspledgersclass.com/uploads/1/3/1/4/131406104/8c90282.pdfIn PDF document text
    • http://files.balkanhistory.org/uploads/1/3/1/3/131384679/5414953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bokisutedex.files.wordpress.com/2020/07/jevile.pdfIn PDF document text
    • https://vodupabaneze.files.wordpress.com/2020/07/50250481342.pdfIn PDF document text
    • https://xutosazibovi.files.wordpress.com/2020/07/87304041065.pdfIn PDF document text
    • https://migeleki.files.wordpress.com/2020/07/31329875628.pdfIn PDF document text
    • https://datunexa.files.wordpress.com/2020/06/fapawurotijaladevib.pdfIn PDF document text
    • https://naxopovo.files.wordpress.com/2020/07/ruviguxuzelapumuremuxe.pdfIn PDF document text
    • https://wiwamadujiw.files.wordpress.com/2020/07/pubej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/46424550507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/favenagufefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/13345106857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/kurajafesebejigagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7016 5272 bytes
SHA-256: 9c4e9d28a91ab6271cc6b592d2580bbee71e1fcac009497f044f2bff37390a07
font_01_sfnt_off000081ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EF 9744 bytes
SHA-256: b621ace7efafe12c34923703c026014f1ce215f8990a9a4389f7c47f5cdfc8f3

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