Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3784528ac1c136…

MALICIOUS

PDF

128.8 KB Created: 2020-07-29 21:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81d79992c22cbc4accb7da53257d7d2 SHA-1: 9e93995429a13f5f8c30c17db423d2b6154eb2c1 SHA-256: db3784528ac1c13606e77a6bc716e2239d295639303fd485ab04a0328a551a11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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.com/pify?keyword=logic+gates+pdf+class+12
    • http://files.tracymgdesigns.com/uploads/1/3/1/3/131379939/ramupoxidi.pdf
    • http://files.ninjateachers.org/uploads/1/3/2/7/132740511/nenewodufa_kejivipew.pdf
    • http://files.lisa-cooper.com/uploads/1/3/1/6/131606331/2716873.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/66080875711.pdf
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/gafaxugakejo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/gesisikiveji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/87319510152.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/9755974504.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/xowukunijegepus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/42660917617.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/3442778453.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/76038232223.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_off0001bb49.bin
1d51e2357a74d5e3cd7da5d15c65e781a1080fbb6d45c1c48205bcaad769908e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB49 5032 bytes
font_01_sfnt_off0001cc80.bin
92131e1a8ba08c3adca41eaac669fb2e20d188aae9b57b4908934d80cd4e0152
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC80 13284 bytes