Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca8cc79ee5b1cbe…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 14:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391117f445484d789948192ed4a4b7c4 SHA-1: 52176bc840e887a43b77e04bff04c01a42406b59 SHA-256: 3ca8cc79ee5b1cbe3df90705a3ec59320a39458533ec3add2160d5832717d02f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=vehicle+lifting+points+pdf', which is a critical IOC. The presence of numerous Shopify links suggests a link farm designed to obscure the true malicious destination.

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/wix?keyword=vehicle+lifting+points+pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/fonujoxozunavipaluxez.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/fadefunijepufa.pdf
    • https://cdn.shopify.com/s/files/1/0463/2448/2210/files/galaxy_watch_active_answer_whatsapp.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/1603978696.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/62386178371.pdf
    • https://cdn.shopify.com/s/files/1/0440/8338/0376/files/36674849353.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/katalog_sandvik_coromant.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/leeuwarden_restaurant_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_610bb65e555444e9b01fc274d07c311d.pdf
    • https://static.usrfiles.com/ugd/accd1f_c574e2bbfa31403aaec5d02175589a25.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3a449a4cffc487d994f167b764bb8c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1467a39025ce4bce8b4f3f68e8e28027.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_off00005f89.bin
118f2f80df587093a261f48a5f446685dc8e677b8f42fd32f6ee8e73fad71f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 5076 bytes
font_01_sfnt_off000070cf.bin
f45a802bb4e81e79a988ccf2be3830dcb60a00248a138108e541cee2419a3491
pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 10520 bytes