Malicious PDF — malware analysis report

Static analysis result for SHA-256 de311932fcf94c13…

MALICIOUS

PDF

39.9 KB Created: 2020-07-10 17:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6b6f969266f720cd0cb919b2bf46fa SHA-1: 0e7d2f8cfa84e69a8dae0b152f642d88dfcc4f99 SHA-256: de311932fcf94c138b26926b115038783d2e71f43abe7d4078229001b2288ffc
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF hosting sites, indicating a link farm or SEO poisoning attempt. One prominent link redirects to `https://ttraff.com/pify?keyword=chemistry+notes+class+11+ncert+pdf`, which is flagged as a malicious redirector. The document body, though partially corrupted, contains similar keywords and URLs, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=chemistry+notes+class+11+ncert+pdf
    • http://files.petra1929.co.uk/uploads/1/3/2/6/132695333/rasisugamut_fuvamuwokeza_zapudojov_zijegidavopomi.pdf
    • http://files.focusedlearningsolutions.com/uploads/1/3/1/6/131636990/49d8e9.pdf
    • http://files.gentrylaw.com/uploads/1/3/1/4/131407857/xaborumanatu-fujupegifedute.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdf
    • http://files.yogitreewellbeing.com/uploads/1/3/2/3/132302919/somuxexederoko.pdf
    • http://files.stephaniebershyoga.com/uploads/1/3/1/3/131379371/1049198.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://files.mkgeducation.com/uploads/1/3/1/4/131409333/fbe991ae66e0dc.pdf
    • https://zezupid.files.wordpress.com/2020/06/31778364152.pdf
    • https://lotodirod.files.wordpress.com/2020/06/70435217770.pdf
    • https://datunexa.files.wordpress.com/2020/06/luxejetobetirapar.pdf
    • https://womotisuxapo.files.wordpress.com/2020/06/gegamukaterir.pdf
    • https://kijijoniwe413232708.files.wordpress.com/2020/07/kamoled.pdf
    • https://juwifiluga.files.wordpress.com/2020/07/66174838140.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/ribitemiroja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/nazuximusijimiwarav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.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_off00005e85.bin
18609ea5a13b86597021862fdf4cb9cb30d2b7b89ac0b9af2d10efeaf2245bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E85 5360 bytes
font_01_sfnt_off000070a0.bin
c2381018cd8c2b07f750113246205192283905d31fd842253bdd2dffc1a42fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A0 9840 bytes