Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e4abd819d78326…

MALICIOUS

PDF

56.3 KB Created: 2020-08-09 01:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f072d8fdcc648e5f1f03bbf4395b7f SHA-1: aedc87d8cae75a151696ea2f4432b1952d8af30d SHA-256: 14e4abd819d78326fd3dfb4e4023e20281548533a356f581c18cb37cf0c4438b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, with the embedded links serving as the mechanism to deliver further malicious content.

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=calculus+and+differential+equations+in+engineering+mathematics+pdf
    • http://files.teresaofavila.org/uploads/1/3/1/4/131437341/josog.pdf
    • http://files.charisacctservices.com/uploads/1/3/1/6/131606758/caf2cc85aa266e.pdf
    • http://files.parsippanyfriends.com/uploads/1/3/1/3/131379680/xoxetitugusa-padij-kamewawozuvo-vexazatusi.pdf
    • http://files.oahas.org/uploads/1/3/0/7/130776204/1825424.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/wewanaviwarovezaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/jixoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5435/7910/files/renal_aplasia.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/dexamezasafilal.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/wimatolomute.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4453/files/agnes_heller_historia_y_vida_cotidiana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/94717575952.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/69414709876.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/24444281387.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/hero_clickers_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0438/9706/1531/files/76706471352.pdf
    • https://cdn.shopify.com/s/files/1/0450/2798/3510/files/the_alabaster_girl_file.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_off00009bc6.bin
c564f91d04e263ca01f38337f487c41e8388a5fd6128a2589d5239d1a13aab80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC6 5600 bytes
font_01_sfnt_off0000ae99.bin
2402d01faa542fffb3e1b67ce7aa857897696368456bec05b0eb976fc45e5ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 10776 bytes

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