Malicious PDF — malware analysis report

Static analysis result for SHA-256 8007bf39ce76d1e2…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 14:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37907447b60fe277eb5390b4bb26de00 SHA-1: 296f659fb67ab8d461fabdc1300ad8267dbb229e SHA-256: 8007bf39ce76d1e2eee4148e8f711b1af02b4060da17b830c182cb98df6090e0
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text related to a recipe, suggesting a lure. The PDF also contains a large number of external links, characteristic of a link farm, which is often used to improve SEO for malicious sites.

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/wix?keyword=chicken+thighs+recipe+baking+sheet
    • https://static.usrfiles.com/ugd/87d215_ae144de964f74562b5ad41dbef2cbec5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed65bc8767a9478181d30ce0d073edcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_762b6dbac868490a9eb1d82683b1ecc1.pdf
    • https://static.usrfiles.com/ugd/3f0e57_99c3c5439c704f1f8a53068bbc519d99.pdf
    • https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
    • https://static.usrfiles.com/ugd/55cc32_f44c7ec4cb0046c586dd0a2772c764ac.pdf
    • https://static.usrfiles.com/ugd/c836c3_f2e24f9095f04f558a3d07f8d207e6d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_459574c9743243d98399766eae500ad1.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/best_free_driver_updater.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/sims_3_baby_cc.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3935/files/12190777075.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/117303673.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
font_00_sfnt_off00006c80.bin
35d8d93ddcd04fb1d0c3f0da56401c79c2a583f42b43ebac0870fe8cd8bb430a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C80 5068 bytes
font_01_sfnt_off00007da5.bin
2ad05d6f3ae3cb6ceeaaa77261f30ea89da2fd636bffcffe5e22346997b993e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 10504 bytes
font_02_sfnt_off0000a181.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA181 4324 bytes