Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78786b92e19198b…

MALICIOUS

PDF

104.3 KB Created: 2020-08-10 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e99e287497c491d6bc883c99924d9367 SHA-1: a667dc7a71429d6624bde8e70ddd8fbf80c98a29 SHA-256: e78786b92e19198b0d966a15d7cf216f64253487b865f0e85c4939a101a6b22c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=behavioural+analysis+pdf, suggesting a lure for the user to click. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to potentially malicious domains. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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=behavioural+analysis+pdf
    • http://files.silencednomoreasoldierscourage.com/uploads/1/3/1/8/131857049/vaxip.pdf
    • http://files.nzrallycars.co.nz/uploads/1/3/1/4/131438784/zijonaj.pdf
    • http://files.buttercupbakerymb.com/uploads/1/3/2/6/132695651/pilegato-sisexokivekased-mavejen.pdf
    • http://xuxinaga.agratefulnote.com/uploads/1/3/1/4/131437601/d3c384c8.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/vexezopekatufuxuzodop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/kanakadhara_stotram_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/61200118574.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/66740214518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/angle_grinder_uses.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/ostentatious_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/62917269965.pdf
    • https://cdn.shopify.com/s/files/1/0450/4682/5110/files/drivers_manual_nj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/25005488442.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/big_ideas_simply_explained_art.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_off00015caf.bin
98c514b763bd0d36df0d30b234522f81f5b7783efffd89eb67a7f6c67ab2560f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAF 5340 bytes
font_01_sfnt_off00016edf.bin
83715b9f53973f1ec85288b0776e17cb56833f3833d85d366c3fa808cef2f375
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDF 10880 bytes