Malicious PDF — malware analysis report

Static analysis result for SHA-256 2773fe78708394e5…

MALICIOUS

PDF

41.4 KB Created: 2020-10-02 08:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0303af4979d231884114228e6b221020 SHA-1: 31f46ed9cf06e29d51a0fb9c44c55bc1a033cba6 SHA-256: 2773fe78708394e5bd64000bee7dccc27a2d6361bc48abe7c81640a7701b96e1
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=huniepop+no+download In PDF document text
    • http://files.innerheartpathways.com/uploads/1/3/2/6/132681002/46e9335.pdfIn PDF document text
    • http://files.mygrandmabillieskitchen.com/uploads/1/3/0/8/130813821/645576.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/1/0478/3960/8991/files/97796553662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4612/3937/files/rominidife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6700/2018/files/48181907129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0316/6371/files/17451780637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816f39c3-8a54-4d3a-b546-aebd7d92f684/26635867517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/golf_croquet_rules_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/guxezemikab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0084/2405/files/66434565905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4891/4081/files/utsw_match_list_2015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2479/7855/files/20152468197.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_off00006638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6638 4732 bytes
SHA-256: 6169c06013743ad7ebd5ff56782b7d170ecbd7725f1ab8dbac1703145782d6a0
font_01_sfnt_off00007675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7675 10208 bytes
SHA-256: 87f4272c8e64311ffdb534eb04953c9acf680f73a1c8d41e95d6a3ce4f5039be

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