Malicious PDF — malware analysis report

Static analysis result for SHA-256 146ee2acf86e800d…

MALICIOUS

PDF

46.0 KB Created: 2020-08-22 14:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e800d5cf56738658ba39eb2f153d56fe SHA-1: 531b32704f6d202d285b308e150660526f902ed4 SHA-256: 146ee2acf86e800d12a9655a4d27b64df674de2f3e623297f21001cea4a9f9e6
154 Risk Score

Malware Insights

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

The PDF document contains a lure promising cheap Android phones, directing users to a malicious redirector URL. It also features a large number of embedded links, many pointing to benign Shopify URLs but also including several unknown and potentially malicious domains. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests an attempt to drive traffic to malicious infrastructure.

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/pify?keyword=android+phones+under+3000+pesos
    • http://files.sophiebehal.com/uploads/1/3/2/3/132303082/f85b8f922.pdf
    • http://tijex.augustiniana.net/uploads/1/3/2/3/132303307/e08d62be5d7.pdf
    • http://zupitugax.0702stonestore.com/uploads/1/3/1/4/131483281/mexutudomanogiwal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/23272644569.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/81422254476.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/sologezurerelevaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/22115642716.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/kawanuredejipup.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/goosebumps_book_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/atomic_structure_models.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/dasimubasiwofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3303/files/35345690684.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/60156562426.pdf
    • https://cdn.shopify.com/s/files/1/0431/3432/0794/files/reserim.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1373/files/waluxiwaliruzaka.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/notoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/10th_bipartite_settlement_full.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_off000075ca.bin
70b48557bd9f589284e93baec502679e53d71454891ed1f5db28716271e372f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 5100 bytes
font_01_sfnt_off0000871d.bin
3edc84219a63e11dc176c9ec071952cee5591954d924eb14ef19da0f37495d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 10564 bytes

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