Malicious PDF — malware analysis report

Static analysis result for SHA-256 76573620be52044e…

MALICIOUS

PDF

44.0 KB Created: 2020-07-14 05:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: f31268d9f2e711e55d06b0306d2b2bf6 SHA-1: 306adc4d4f78c789710b55d670c335ab33589cf3 SHA-256: 76573620be52044ecf502fa750e288adad248f3f5adf970a688f17e38d7b4b36
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are part of a link farm designed to obscure malicious redirectors. The primary malicious link, 'https://ttraff.cc/wb?keyword=worksheet%20for%20kg1%20free', is identified as a known malicious redirector. This suggests the document's purpose is to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9118314-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9118314-0
  • 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=worksheet%20for%20kg1%20free In PDF document text
    • http://files.camppepper.com/uploads/1/3/2/3/132302913/1217584.pdfIn PDF document text
    • http://files.windhorseadvancedhealing.com/uploads/1/3/2/6/132681634/10a08d2a42c2.pdfIn PDF document text
    • http://files.425sqn.org/uploads/1/3/0/8/130814642/zotazaboma.pdfIn PDF document text
    • http://files.cmenergyinsight.com/uploads/1/3/2/7/132740716/duligojifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://womemoz.files.wordpress.com/2020/06/nixupowasuweguve.pdfIn PDF document text
    • https://digogaba.files.wordpress.com/2020/06/94950999511.pdfIn PDF document text
    • https://puvudoxewe.files.wordpress.com/2020/06/47700061204.pdfIn PDF document text
    • https://xebiwabas.files.wordpress.com/2020/06/84579355052.pdfIn PDF document text
    • https://lusigezoxot.files.wordpress.com/2020/07/zivubozekevozafefivitoraz.pdfIn PDF document text
    • https://ruvirimijoxi.files.wordpress.com/2020/07/molega.pdfIn PDF document text
    • https://petudelixax51916226.files.wordpress.com/2020/07/nutodexobuzujaw.pdfIn PDF document text
    • https://sotarobimubu.files.wordpress.com/2020/07/96965681139.pdfIn PDF document text
    • https://zevazodofo.files.wordpress.com/2020/06/67062319089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/25990063655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/49837227919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/99951020086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/woruwokiregizibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/42206928117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/libure.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_off0000716b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 4548 bytes
SHA-256: 8e1bc43d5220f4808107de189aea35bf71838fbca2ae848fbbab86405112d2ea
font_01_sfnt_off00008111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 9884 bytes
SHA-256: d6aa005f9462f7443e55fb5d042c711b15ef3e8594970d0ec6025bde984d159d