Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e96b126acf53cfe…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 19:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284fa6f64b21876462b478c5bf2706d2 SHA-1: 102c80a6bb828dbb0bde6d04ddf199010cba50fa SHA-256: 5e96b126acf53cfe6cb10bf19e1c3fec325448f4d04a5b1199a757303ad6fa97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is likely intended to lure the user into clicking on it, leading to the malicious redirector.

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=factors+influencing+consumer+buying+behaviour+of+luxury+branded+goods+pdf
    • http://files.tcayearbook.com/uploads/1/3/2/7/132741334/adca495e6bd.pdf
    • http://files.buyfloridahomes.com/uploads/1/3/0/8/130813777/tekugapibifaxub.pdf
    • http://files.saharaseniorservices.com/uploads/1/3/0/7/130775071/bavusazariboxa.pdf
    • http://files.lotusvivant.com/uploads/1/3/1/8/131856276/limevagezubo.pdf
    • http://files.discoverycdtech.com/uploads/1/3/0/8/130814535/4e969fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/musagefusaralusojemas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/68994704555.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/tolobuvimipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/dimowi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/22361637355.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/dieta_para_cancer_de_estomago.pdf
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/programming_tutorial_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/63076126521.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/47633841401.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/jugedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/nosazutag.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/63181593236.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d51.bin
badb1b92166e4723837dbaf4a9f243185e72cec78b8d12ec750d295b07cfdba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D51 5892 bytes
font_01_sfnt_off00008149.bin
9ca43ea35a6e79370f59b777671d55792e5795a92afba840bb756f4683e6ca1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8149 10284 bytes

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