Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a76f5ee2d8eab5…

MALICIOUS

PDF

51.9 KB Created: 2020-08-09 10:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd1fd91c64a47b403af07c739d235c5 SHA-1: 47e1598f3fb90ca5f929874f24df826bcad808b6 SHA-256: 55a76f5ee2d8eab5acd5e3d0500585e7d311e98c559455dd051b3c9c7f7ecd60
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, which is likely intended to host a phishing or malware delivery page. The document body, though heavily obfuscated, contains the text 'Histology of bone pdf' and the malicious URL, suggesting a lure. The presence of numerous other Shopify links, while marked as benign, indicates a potential link farm strategy to obscure the malicious destination.

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/pify?keyword=histology+of+bone+pdf
    • http://gonuj.jaysgolfworld.com/uploads/1/3/0/8/130874655/7283223.pdf
    • http://files.ellenaltjudaic.com/uploads/1/3/2/7/132740598/vewuruj.pdf
    • http://files.loenerhof.com/uploads/1/3/0/9/130969356/petaroramogobus-punubajufuse-volapokapisux-mevib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/77836646535.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/vesudusukaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/65829387473.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/bowukodinusomaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55742160690.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/rewimagelimazamaruz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/dark_angels_painting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5866669006.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/64331582121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/zapefax.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/36028016722.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/machine_learning_algorithms_jason_brownlee.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/78650841932.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/
    • https://cdn.shopify.com/s/files/1/0433/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c8e.bin
5a07d1fd47bc85cecf0a8ba945839a6a6d59dbc70bf23e7579fa3d585cf58622
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8E 5108 bytes
font_01_sfnt_off00009e09.bin
3e79e25690137d9d84f14d3b2156ba2cf564198328445d1200dd66acb1b41722
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E09 10700 bytes