Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9eeb1fcf7fdba4…

MALICIOUS

PDF

54.3 KB Created: 2020-07-25 15:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a64810a573988cfa1002e17e4ae4a925 SHA-1: f4f1da8c2621e41b1764e984ed57a43a908a55e9 SHA-256: 5e9eeb1fcf7fdba442c73df0125306067e4fa7e9c6968d2ac9da3a50d7530808
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for 'speak now 2 pdf free download'. The presence of numerous external PDF links, including one to a malicious redirector, strongly suggests an attempt to direct users to malicious sites for phishing or malware delivery.

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.com/wb?keyword=speak%20now%202%20pdf%20free%20download
    • http://files.balnarringvillagecommon.org/uploads/1/3/1/4/131407045/7de34f3e2d0b9.pdf
    • http://files.comechatwidmi.tv/uploads/1/3/2/6/132695336/b86f8a.pdf
    • http://files.sailrockaway.com/uploads/1/3/0/7/130775867/5480c.pdf
    • http://files.midwestdressage.org/uploads/1/3/0/7/130776351/4098975.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/39978161613.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/bazojebokogegobumoruje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/66180587190.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/putumobozapisefoxelevur.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/sozetodilubufunadiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/xakugepokasal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/sewopuwolipumugutesux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/xukeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/ximatupegobevewinul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/povigofituzukovixanolife.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/90321796114.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/fubumuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1676/files/85053742360.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/vagazivugogavapalepote.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_off000091ec.bin
c456d53062c0dc6d5433614ecb6b4dbda00d76afa17518408e1d314d7edbacba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91EC 4908 bytes
font_01_sfnt_off0000a2b6.bin
06123d4fe70b7f8182422a41eeb4ec04d9be88ec48fe6de2ff2efc0264d2da9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B6 13348 bytes

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