Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfa4be8ff96d68b…

MALICIOUS

PDF

39.6 KB Created: 2020-07-16 03:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 041a98a3eb880c9571ac41c03b20fadb SHA-1: 1bcc59e954faedae0cc00da86ba004c3fa4831f3 SHA-256: ecfa4be8ff96d68b3cad07f3a13f36ff6a90f93a80baaa850519c41deb8005f0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a "Kenneth cole touch screen watch manual". The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates a phishing or scam attempt. No scripts were extracted from this sample.

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=kenneth%20cole%20touch%20screen%20watch%20manual In PDF document text
    • http://files.vancouvermermaid.ca/uploads/1/3/0/7/130776176/85d673715a18205.pdfIn PDF document text
    • http://files.beso.co.nz/uploads/1/3/2/7/132740682/a3d08262ae3.pdfIn PDF document text
    • http://files.alive-events.com/uploads/1/3/0/7/130775505/9987633.pdfIn PDF document text
    • http://files.grandmasquilthouse.com/uploads/1/3/0/8/130813458/nijavovejibuzid_wozefe_dopukiluzir.pdfIn PDF document text
    • http://files.westaucklandcadets.com/uploads/1/3/2/7/132740564/najumo.pdfIn PDF document text
    • http://files.copelcommunications.com/uploads/1/3/2/6/132695629/sekanufaf.pdfIn PDF document text
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdfIn PDF document text
    • http://files.winnipeggroundschool.com/uploads/1/3/2/6/132695418/vekeronuvakigowopad.pdfIn PDF document text
    • http://files.soulhealingcollegeparklanham.com/uploads/1/3/1/3/131379761/tekagegujemuwenika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sizamivizu.files.wordpress.com/2020/07/dirofinit.pdfIn PDF document text
    • https://xefupixebi.files.wordpress.com/2020/07/44820726267.pdfIn PDF document text
    • https://ruxurogizipo.files.wordpress.com/2020/07/60399429417.pdfIn PDF document text
    • https://fokovuzoviva.files.wordpress.com/2020/07/vunigusiwazek.pdfIn PDF document text
    • https://tejunif.files.wordpress.com/2020/07/44532735339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/filepitomimimifomapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/85486843086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/74889424849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/pobaxidavabixobupananagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/67534629505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/41891539635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/5378026295.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_off00005ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE7 4936 bytes
SHA-256: ca6b5c17c483bd4e2f765356a2f8e75cbdbc36b403b928edfc61c632633a5d64
font_01_sfnt_off00006f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 9748 bytes
SHA-256: 6b49d53d6fa224846e181d8f175a8e94e505a2195ea60ae88f06e4a5dcd0591e