Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ad7d31d50ead56…

MALICIOUS

PDF

45.7 KB Created: 2020-07-19 22:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85582bfdbf5dc50a24cbef70521b04e SHA-1: 68005adc3d41006830908e66672e478c328f4986 SHA-256: e7ad7d31d50ead56fca3d70e063d121aac1fbb1af5f3e977784a36341cd553bd
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Trastornos de la corteza suprarrenal pdf'. The presence of numerous links, including those pointing to potentially compromised Shopify or other file-hosting domains, indicates a likely attempt to drive traffic to malicious sites, possibly for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=trastornos%20de%20la%20corteza%20suprarrenal%20pdf
    • http://files.torratymakeup.com/uploads/1/3/1/6/131607683/a38070e5f.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.kittycomicsworld.com/uploads/1/3/1/3/131383456/f1f2d9d1.pdf
    • https://nudademexu.files.wo
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/33474731151.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/96918762773.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://nudademexu.files.wordpress.com/2020/06/tinebelorafomunolo.pdf
    • https://panamekeze.files.wordpress.com/2020/06/rarodewozapijiwuge.pdf
    • https://xovisir.files.wordpress.com/2020/07/56715824518.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/posuv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0528/files/tumuvipetobowivifenaxefif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/fisipafidizitufutulanovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/giralewuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/84548433119.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/xowifixure.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/38784345461.pdf
    • https://cdn.shopify.com/s/files/1/0431/7895/0810/files/gimofawefavane.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/luzexu.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_off000073d6.bin
6ef49b9acd10db2659bdef2a43c098572f35ea984facf272a78435de5bc10f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D6 4980 bytes
font_01_sfnt_off000084d8.bin
e3ef74fdae7b434069632d73868d806c3066b1b195c6fc5fd665ed6580c9a213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D8 10672 bytes

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