Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f54a158c92ccca5…

MALICIOUS

PDF

108.6 KB Created: 2020-07-14 10:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 423e41006b3833e2fd2ba3b723bde170 SHA-1: b3b36e82e613e5b96b88d58518b918efff9b2f74 SHA-256: 9f54a158c92ccca511783ef66b335e2d96b639c99cb73940a00993c2d477ce07
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified is 'https://ttraff.com/wb?keyword=propiedades%20fisicas%20de%20la%20leche%20de%20vaca%20pdf', which is flagged as a known malicious redirector. The document body is heavily corrupted, but the presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

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/wb?keyword=propiedades%20fisicas%20de%20la%20leche%20de%20vaca%20pdf In PDF document text
    • http://files.adventurewithdiabetes.com/uploads/1/3/0/9/130969855/toxozovafadanirekope.pdfIn PDF document text
    • http://files.allornothingnutrition.co.uk/uploads/1/3/1/4/131406600/xabamagativaz.pdfIn PDF document text
    • http://files.pasadenamasoniclodge1155.org/uploads/1/3/1/4/131409794/5326969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://danuduzag.files.wordpress.com/2020/07/sibabovimekobezurapuf.pdfIn PDF document text
    • https://rabedebeg.files.wordpress.com/2020/06/lebiwoguvibazux.pdfIn PDF document text
    • https://wivutotob.files.wordpress.com/2020/06/nawenuvolebivowelifexix.pdfIn PDF document text
    • https://kijijoniwe413232708.files.wordpress.com/2020/06/55953972058.pdfIn PDF document text
    • https://mebusevodon.files.wordpress.com/2020/07/kixara.pdfIn PDF document text
    • https://wapuzebuto.files.wordpress.com/2020/06/wexakadodewaduwepeda.pdfIn PDF document text
    • https://nedidama.files.wordpress.com/2020/06/xeruwinuriguwazosu.pdfIn PDF document text
    • https://guzubuxokom.files.wordpress.com/2020/07/buxejolegijux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/pabazimepivodopuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/xapexamipigimirakami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/kutaluwegesizokuvowure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/taparugidobaxegajokijuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/1903199516.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_off00016e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8B 4908 bytes
SHA-256: 1725061e37ce3cffc72cfc3b5664027ae970bdcddb282cb0457293d883af6ced
font_01_sfnt_off00017f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F48 11360 bytes
SHA-256: 79a42e78a6e63e7a57248c55ecb3d0bb72d48f7a4552803dda695784881570e6