Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2473a4075f57d7…

MALICIOUS

PDF

44.6 KB Created: 2020-07-18 06:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 373d3517116e88574b58597d77d7b60a SHA-1: 88c377fe105d7e81b50a2dccbc7b8adbe9d8022a SHA-256: 7a2473a4075f57d7e0e5c341b2201eb64808072de69e0e7a389f8f90d556179e
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure and SEO link farms. The primary redirector URL is https://ttraff.cc/wb?keyword=celula%20animal%20vegetal%20y%20bacteriana%20pdf, which is likely used to obscure the final destination. The document's structure and link farm suggest an attempt to distribute malicious content or phish for information by luring users to click on these links.

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=celula%20animal%20vegetal%20y%20bacteriana%20pdf In PDF document text
    • http://files.raynayler.net/uploads/1/3/0/7/130739510/8092526.pdfIn PDF document text
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdfIn PDF document text
    • http://files.jessicamixon.com/uploads/1/3/0/7/130775033/5fc580170ec.pdfIn PDF document text
    • http://files.worldsbestpinotage.com/uploads/1/3/0/7/130775867/degimosuxatomotobe.pdfIn PDF document text
    • http://files.rfjnoel.com/uploads/1/3/1/4/131452935/6eb2d1aed91.pdfIn PDF document text
    • http://files.obituar.org/uploads/1/3/0/7/130776151/c2e407b11e9.pdfIn PDF document text
    • http://files.goldendebt.org/uploads/1/3/0/8/130813108/8c253dc6708e36.pdfIn PDF document text
    • http://files.buickcluboftheredwoods.com/uploads/1/3/1/4/131438741/4931704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kalafinis.files.wordpress.com/2020/07/podasugawasanevagoramut.pdfIn PDF document text
    • https://fewiveke.files.wordpress.com/2020/07/tonatogogineturibewixu.pdfIn PDF document text
    • https://suwaboto.files.wordpress.com/2020/06/pagesiripugida.pdfIn PDF document text
    • https://xebedidepu.files.wordpress.com/2020/07/16482294132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/58789804517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/17869687103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/toroxixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/xetonafuzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/43355992932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/nopodudopowukajig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.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_off00006f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 5396 bytes
SHA-256: 2caac53e820e57f343904c03016921ccf2766c781a88da3161fa16685258bde5
font_01_sfnt_off00008178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 10696 bytes
SHA-256: a85ce103c189ba7c348315aa15f3873d81d5d4c4d5bb1e5354f1d3b16fa1af44