Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd194eace8767d4a…

MALICIOUS

PDF

63.7 KB Created: 2020-07-30 22:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b18fc39be67e9d346fa04b8d73b7cd SHA-1: 468491e3b0047a4a343274e03661433a53630e62 SHA-256: cd194eace8767d4a00e8da25ce2227838f276d9ddaed9d24ea0d0e5f7ba915df
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=biot+savart+law+proof+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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.ru/pify?keyword=biot+savart+law+proof+pdf
    • http://files.nightwispdesigns.com/uploads/1/3/2/7/132740260/peviwobejis-zefemi-sopuvinamorul.pdf
    • http://files.risefremont.org/uploads/1/3/0/7/130775635/3771843.pdf
    • http://files.joshuahookart.com/uploads/1/3/1/3/131381658/1027776.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/majupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6230/files/92085527288.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/libojafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/midigapulidijizuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/25885662683.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/kobemede.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/69095723433.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/zuvefaraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/42997138727.pdf
    • https://cdn.shopify.com/s/files/1/0434/8755/9833/files/65569676012.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/gabevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/potififekogedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1629/files/64383233085.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_off0000a2d5.bin
af28e824fd7a1064d8a23e946720921baf34455a89632abe61a669cd02cd50f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D5 4800 bytes
font_01_sfnt_off0000b347.bin
2568b208bec259090cd0d6ecd99c1b8aa328a1eeb6dfe324161520a750521eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 11644 bytes
font_02_sfnt_off0000dacd.bin
b428aa5f6ba948456a73360b620b36dad48c841005e7586f64776c71b73a69f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 16360 bytes

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