Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd2411077f236d…

MALICIOUS

PDF

51.3 KB Created: 2020-07-31 13:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70eea6c9c187c3c6419e851817b84b03 SHA-1: 60a4902da2658a2d6aeb645d082430ccb4bc1e4e SHA-256: 18cd2411077f236d3609d3714160903522786a3a38bf72206b07a1301834327e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL pointing to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the malicious redirector suggest an intent to lure users to harmful content, likely 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.ru/pify?keyword=beehive+class+9+pdf+chapter+1
    • http://files.daviesfurniturecourt.com/uploads/1/3/2/6/132682883/jukudotelusa.pdf
    • http://files.colleenlboyle.com/uploads/1/3/1/8/131857920/a2fa3f7a58e.pdf
    • http://files.hodaemam.com/uploads/1/3/0/9/130969357/xixozotujera-suzibu.pdf
    • http://files.belmonthighlibrary.org/uploads/1/3/1/4/131453990/xebegugozanujumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/bovunidojosigil.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/26254892867.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/11841204854.pdf
    • https://cdn.shopify.com/s/files/1/0428/5503/9135/files/54991557925.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/39646243039.pdf
    • https://cdn.shopify.com/s/files/1/0438/0862/0701/files/tupok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/96850819649.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/6757860787.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/fasefafeworenekux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/zobulagodat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/75418517294.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/51774371787.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/xemurivow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008028.bin
7ce01edd8569e690ff4a03e40ea761f5e7ccc92724751fd83576240a8e6fc960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 5132 bytes
font_01_sfnt_off000091b4.bin
91b602b3037a85128dd2af3713f33a439cec26d4be8cac8bc282076598d8107f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B4 10120 bytes
font_02_sfnt_off0000b4ad.bin
bd430654397ecdfebcc9893999aa4ed47253faafb40014c5eb9e02b1a13600cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 2748 bytes

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