Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f829d15ba592d2a…

MALICIOUS

PDF

63.1 KB Created: 2020-07-31 13:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f391c9c86a4792e17d4bb83158a2acd5 SHA-1: cbaa6b89dec57909e04c945b78e989c415ecc9a1 SHA-256: 4f829d15ba592d2a201eb864fc373d48100dc274936e1c7de8d0239ef1baa81b
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be related to agricultural products, likely a lure. The presence of numerous links suggests a link farm or redirection strategy to distribute malicious content or phish users. No scripts were extracted from this sample.

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/pify?keyword=processing+handling+and+storage+of+agricultural+products+pdf
    • http://files.zelmerwilson.net/uploads/1/3/2/6/132696580/c61be22da1.pdf
    • http://files.aacabluegrassregion.org/uploads/1/3/0/7/130776409/43c9ed1.pdf
    • http://files.daddycandoittoo.com/uploads/1/3/1/4/131406258/9844640.pdf
    • http://files.thefoodiemum.com/uploads/1/3/1/8/131858540/5013571.pdf
    • http://files.fencenola.com/uploads/1/3/1/6/131637136/9759252.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/zuzatutaluwusibunexiran.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/88628589693.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/narajiki.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/xiwuloj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/fabepekup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/larebukuvufikojugisezim.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/11196980720.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4277/files/novudisovisavivusejetod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/97803813597.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/wosazakupu.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_off0000ba65.bin
a6d00acb3b8bf116a99ed0efcc549373b3db1f38e0b771c116104d8cbd43d9d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 5300 bytes
font_01_sfnt_off0000cc52.bin
cd3e6bb124c8f651017868519b0afe73d587430fbd7df5e95fd4c7aba95ccffd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 9996 bytes