Malicious PDF — malware analysis report

Static analysis result for SHA-256 657ae96cd3dbd6b3…

MALICIOUS

PDF

46.4 KB Created: 2020-08-20 08:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154189d3caedbfffc8b3299c6a6e475e SHA-1: bfebbd9ae1760a662204da88fd7e664f2fe32cdd SHA-256: 657ae96cd3dbd6b31a789a0c4406a52c3f1c3e2adf79ecdebc6d3e89be8382ab
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains multiple embedded links, including one to a known malicious redirector infrastructure, and heuristics indicate it's a browser installation lure. The document body, though partially corrupted, suggests a 'Windows 10 update' lure, aligning with the SE_BROWSER_INSTALL_LURE heuristic. The presence of numerous PDF links, many pointing to Shopify, suggests a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=windows+10+1903+offline+update
    • http://files.dallasbrunchclub.com/uploads/1/3/0/7/130776447/tofubovaw-tuvovabunatabep-purigokobezelad-turanamoj.pdf
    • http://files.rayzimmermanauthor.com/uploads/1/3/1/8/131871555/pemawi.pdf
    • http://files.andyyanchunis.com/uploads/1/3/1/3/131380754/c20d5.pdf
    • http://lotujof.stonegatekilleen.com/uploads/1/3/1/6/131606490/8c4fc9922eda289.pdf
    • http://boneso.stfrancesbasketball.com/uploads/1/3/1/4/131453741/f71994dc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/duzazudifixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3205/9810/files/24744287433.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7135/files/aluminum_sheet_metal_30_gauge.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/24578480579.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/dizefisej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/working_capital_management_project_synopsis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/7266336473.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/mapazedonemevex.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/pevevefawagotesugujibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/lepaliveju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000692e.bin
b26f137c102fe5fc8eccf6df7b38c98521f25a89d05be06eea58196dc6d3ee84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692E 5440 bytes
font_01_sfnt_off00007bd2.bin
0090f7663ec930b2afc4f2b46f23207bbd0b4942ab78d04a7ae03b18042a19bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD2 10180 bytes
font_02_sfnt_off00009e9b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9B 4324 bytes

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