Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5358adae3fb218c…

MALICIOUS

PDF

48.9 KB Created: 2020-08-07 23:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a685771016b15f8cdc112168a59683c6 SHA-1: 2af833713f30be33dcc5275b15272fb722594c6f SHA-256: a5358adae3fb218c96dede3c50f7801dace30588bdcf785b96b808cc14183bfa
194 Risk Score

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.com/pify?keyword=air+pollution+caused+by+industries+pdf In PDF document text
    • http://files.oaunity.org/uploads/1/3/1/3/131380618/pezufagubaduve_kezaxofe.pdfIn PDF document text
    • http://files.samuelosterhout.com/uploads/1/3/1/8/131871625/9428558.pdfIn PDF document text
    • http://files.thejaspertree.co.uk/uploads/1/3/1/6/131637806/1466423.pdfIn PDF document text
    • http://files.christianlitforafrica.org/uploads/1/3/1/8/131856331/9594948.pdfIn PDF document text
    • http://nekujile.fatzdomino.com/uploads/1/3/1/3/131379730/a3463e2a0d0ea5.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/1/0437/5219/4202/files/gusutetodofisotosukerate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/gurige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/27282114980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/59465413100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4015/3511/files/biology_notes_for_class_9_chapter_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/74674848501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/84395574901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/15830609548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2833/3222/files/zepik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3870/1728/files/revealing_module_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/44625384892.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_off000080f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 5380 bytes
SHA-256: 8499b7ba2489fffdbfa489723035975bf12134590990d3baee570c11dc433dae
font_01_sfnt_off0000934e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934E 10364 bytes
SHA-256: f2f4bd20eb2c0f0f6414a9f49846e85575560218fb739e07afa97aa39b4cd155

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