Malicious PDF — malware analysis report

Static analysis result for SHA-256 71165b107f918338…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 23:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30e55368329f2cbe34cd3ea2f39fb4b SHA-1: f006ea00e413ecf69fdbc94e3e6e9925216d4c7c SHA-256: 71165b107f918338225ac00d55c6ac73a033df570b41f7f4ec7c867c378c4bf6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=weather+report+of+patna+last+week', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a weather report, likely serving as a lure. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm strategy to potentially obscure the malicious destination. The ML classifier strongly indicates maliciousness.

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/wix?keyword=weather+report+of+patna+last+week
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0008/6175/files/9156191094.pdf
    • https://cdn.shopify.com/s/files/1/0460/3717/2383/files/cube_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/32708596143.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7288/files/nivume.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/typing._com_hack.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/24946718969.pdf
    • https://cdn.shopify.com/s/files/1/0434/8257/9110/files/69184738252.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/mavikegetukanafabun.pdf
    • https://cdn.shopify.com/s/files/1/0438/7402/5640/files/lufaxafijinumuzowevenon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/fekaviku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/10056142333.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/blessed_assurance_lldm.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/rugeta.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/6395496351.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006130.bin
e1adf2e813956e3d24ad686386dd5e41c0d81fad0c2a9ad608ecbddbebe20dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x6130 5156 bytes
font_01_sfnt_off000072d1.bin
d2338a60edbf3e65977e5d4003773609a4c321d981bfce1d5586b5475047b5fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D1 10216 bytes