Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8307f3da2fa9ab2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-01 19:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54999d30c0a30bdec1cb5254fe29de7 SHA-1: ae797bd11863effd795daeea8121ce6400748480 SHA-256: d8307f3da2fa9ab2f5778be31ced3d4d05374be158b59a087f49d4a3b3cb711c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=enrolled+agent+salary'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on shopify.com. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking PDF filename, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of a malicious redirector and link farm strongly indicates 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=enrolled+agent+salary
    • http://files.deevineimaginations.com/uploads/1/3/1/8/131871614/tubugeferoruwox-tedivurex-rawuz-sadexor.pdf
    • http://files.pinkrobyndecor.com/uploads/1/3/1/4/131454766/9017268.pdf
    • http://files.madisonmedium.com/uploads/1/3/2/6/132680796/xanab-lasovudufu.pdf
    • http://files.agbio-inc.com/uploads/1/3/1/3/131398322/liluvunoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/vixatabigelaromabuvuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/dukojozugaritig.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/wifiwemilikulutufitik.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/melamewexobalu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/xuwofopapamiruvagafuriv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/zelefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/sajojipomutuvegudubag.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0391/files/jeliwowejosifalajatejopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/nanafizanuraliluv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/tiguvifemola.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/77109629848.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_off00006b7b.bin
c2f1f2d2c54981539c8ab53fdb8ebb04a7e10f7ccdbc99402ee74260bfd1c6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 5052 bytes
font_01_sfnt_off00007cc3.bin
2ce5762ddf28d716398dc5caffeb6b94249c4145136e986c0b0d75522fbf7a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC3 10628 bytes

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