Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681489cfa2de5e0…

MALICIOUS

PDF

47.7 KB Created: 2020-08-18 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b99fb50aa3a6d15dd338dd80f2d79929 SHA-1: fcfaf29d6dce9a7b14e3273298689d582a043135 SHA-256: d681489cfa2de5e00ed91d45fff5dad47805f9e7786b3b101a3dad069226f11a
128 Risk Score

Malware Insights

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

The PDF file contains a lure related to an exam form, as indicated by the document body and the SE_INVOICE_LURE heuristic. It also contains a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.com. This suggests the document is designed to redirect users to malicious infrastructure. The PDF also contains a large number of embedded links, many of which point to Shopify domains, as indicated by the PDF_SEO_LINK_FARM heuristic.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=b.+ed+exam+form+2019+jnvu
    • http://files.lightbulbson.com/uploads/1/3/0/9/130969461/monuposojasis_nejizeju_dalijusopexu_wovuwadifeda.pdf
    • http://wijunu.mariemedhair.com/uploads/1/3/1/1/131164250/909edccc2cc8.pdf
    • http://jobewup.mmlcombat.com/uploads/1/3/2/3/132303079/momareja.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/neue_horizonte.pdf
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/nephrotic_syndrome_dietary_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/jasupejerefipabuwox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/22993734927.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/carbonated_soft_drink.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/62560174292.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/vcredist_x64._exe_2005_sp1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90209356055.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/aapc_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/19510073870.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5270/files/rulegesej.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/5682213403.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a30a.bin
d3cbe823683b3791cfc29e29411841e18e2b4600ea0d76ad2dc16ca00468c67e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA30A 3912 bytes
font_00_sfnt_off000062fd.bin
bea31f9289799fad9f955b2b8f430e0c67df7d8f643ae25a9ab967f14f6583bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 5608 bytes
font_01_sfnt_off0000761e.bin
8c89ca6b0aa93f07c9d729a9b79991353e1ae28d77469f5e1d1ef704f1057c78
pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 14356 bytes