Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52c71997ce697f4…

MALICIOUS

PDF

43.9 KB Created: 2020-08-15 18:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b04cd5c4f30e12b0b6c07c52fff612 SHA-1: 98dc87c2918fba3ed27c16032844cb1b6ae4d771 SHA-256: b52c71997ce697f4fb65f74d5863d68fb7343c542019e2c0951c6bcb0331ac0e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/wb?keyword=nutrition%20therapy%20for%20cancer%20patients%20pdf`. This suggests the document is designed to redirect users to malicious sites under the guise of providing information. No scripts were extracted, but the extensive use of link farms and a malicious redirector is a strong indicator of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=nutrition%20therapy%20for%20cancer%20patients%20pdf
    • http://files.thesilverbranch.com/uploads/1/3/0/7/130775968/8dde1b3bb389.pdf
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdf
    • http://dikakam.legendarycreations.com/uploads/1/3/0/9/130969242/7bd4b53.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/forabidemamuzitoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/rifugarodek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejodogidevetakuranuwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/neranubemowa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/1426189745.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/roxefawomusetit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4760/files/annotate_with_stylus_windows.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/avastar_free_2015.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/96005535558.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/63277884587.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/63095754719.pdf
    • https://cdn.shopify.com/s/files/1/0432/1286/5693/files/first_aid_for_burns_poster.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/tejut.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/71285514794.pdf
    • https://cdn.shopify.com/s/files/1/0436/4664/8473/files/98413069155.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed5.bin
9b634be8d5add18765da4f94a7aab730acf47b7d7ea2da84fa257f7b0c27326d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED5 5280 bytes
font_01_sfnt_off000080cd.bin
46e9d15a885c8ca62f5ff7b296d72e867c4bb047e57c01d848222638b0e89614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CD 9852 bytes

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