Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac81eb53e155b84…

MALICIOUS

PDF

43.7 KB Created: 2020-08-02 16:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32729d1fbd4751648328feec62fd49f SHA-1: ddf5c25c692d58133a57ec19d53d1003d9221ed8 SHA-256: 9ac81eb53e155b844c9023d03ea22e7b27b4a935528c9e22ffbd203524319079
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'Pmx editor download' and references the malicious URL. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be a phishing lure disguised as a software download, redirecting users to malicious infrastructure.

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=pmx+editor+download
    • http://files.carteraccountingandtax.com/uploads/1/3/1/3/131379530/jimeratexojilek.pdf
    • http://files.airbrushingwood.com/uploads/1/3/1/0/131070792/c86f5.pdf
    • http://files.criticalcreativewriting.org/uploads/1/3/1/0/131070501/d637ed641.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/67311872904.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/faxaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/opm_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/28479464640.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/valatabuxazeravijavodi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/kagetide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7918/files/get_featured_image_url.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/dexamebinojuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/36731115263.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/58649646103.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/polaruforiwezekoxaguwovil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/28958678504.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_off00006c6b.bin
57dc3f051e8433daa5d58abe4070305d1ed62cd72467a8cff2127dd81c1747b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6B 4952 bytes
font_01_sfnt_off00007d3f.bin
675a16e9645dbd6be4ae9aaefdc36098a01ffd8ed73f3e5c13eeab29f81e85e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3F 10680 bytes