Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecff741f3dc53bb…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 14:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350faf1442c1ac29df5baf16c80916c2 SHA-1: 7e2253cf98fbce24563cb6ff1326173c3c34a67e SHA-256: 9ecff741f3dc53bb3231e3fa12fb4a2942d83a3d0e86d69dd3dd417533ee3397
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on Shopify. This suggests a phishing or SEO poisoning attack designed to redirect users to malicious content.

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.ru/wb?keyword=chaffoteaux%20et%20maury%20elexia%20pdf
    • http://files.termarkleather.com/uploads/1/3/2/6/132682665/85b01c3aa355523.pdf
    • http://pepopifu.allsaintsappleton.org/uploads/1/3/0/8/130874257/woxesagowobuzo-lupaxuxarul.pdf
    • http://files.amazingauctions.us/uploads/1/3/1/8/131859261/fubolubi.pdf
    • http://files.whotookmycountry.com/uploads/1/3/0/9/130969308/toturike-jenakesunanute.pdf
    • https://cdn.shopify.com/s/files/1/0434/4270/0455/files/12807166642.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.pdf
    • https://cdn.shopify.com/s/files/1/0428/5533/4055/files/63705525025.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/ruvowonegaxuxerom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/6995257274.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/lomiduzabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/39147350226.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/12702967759.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/87063674871.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_off000055fd.bin
09ad30067967e0c804f2c041a181e124c5251a4f80c45555bbefd477b6e25aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x55FD 5176 bytes
font_01_sfnt_off00006786.bin
aea737007712825183a236437b51c7371a8b2ac5b0d283c46f6c36c4e420fb38
pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 14708 bytes