Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4688c726f30604…

MALICIOUS

PDF

45.3 KB Created: 2020-08-19 20:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a094e920e7319423274d518e55f779f1 SHA-1: 2dcee47c37b5d30854fcc297cfb7e4d933358f96 SHA-256: 0f4688c726f30604d260c02b960a65c38f8cdc9c4fb5c239bd86314652ad7488
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=makalah+akuntansi+syariah+pdf In PDF document text
    • http://files.ashcandesign.com/uploads/1/3/2/8/132815123/4174619.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/1/0431/1754/3588/files/79256306476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/libizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/infectonator_survivors_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/posiresosagowefufixogefab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/warhammer_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/3701094651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/tarutorid.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_off0000730f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 5300 bytes
SHA-256: 5c2a4d356acaf7f86006d7afc60f14dbd1850ac43d287ed3fb9108058a9d91a0
font_01_sfnt_off0000851e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851E 10144 bytes
SHA-256: 5825fc5f0976202a10c34dd3669d042ab7c65cd42ad789b75add63180822c0ab

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