Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc7b46f19723d07…

MALICIOUS

PDF

45.6 KB Created: 2020-08-05 06:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efce6818aff26ffc3b769abafe5a1cda SHA-1: 5964bc9bb913e2fd3b51b89af05389a98f50fd31 SHA-256: 4cc7b46f19723d0703cf38463a67fc9d8a8fe7869b4cc50f8fbfd37c58b45d5c
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.cc, suggesting a phishing or scam lure. The document body, though heavily obfuscated, contains keywords related to 'teaching bursaries' and the redirector URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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=teaching+bursaries+for+2020+pdf
    • http://files.vanessamariedewsbury.com/uploads/1/3/0/8/130814063/raditojugil.pdf
    • http://files.megansharma.com/uploads/1/3/1/4/131482823/menikates.pdf
    • http://files.poseidonadv.com/uploads/1/3/1/1/131164236/cae98a8c9.pdf
    • http://files.newarkvalleychamber.com/uploads/1/3/0/9/130969980/5688936.pdf
    • http://files.al-anon-orangecountyny.org/uploads/1/3/1/4/131452806/7756443.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/xevewowagizozomovegabona.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/fumatutaromem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/d_d_5e_playable_races.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/rutugoluxofadijawiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/wowupunuludupimufan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6087/9772/files/kupixudokaladugojaxoduxuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/55095437257.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/sean_paul_like_glue_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/rilaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/24976401182.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/ponuzejikelamij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/pufofubasugape.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_off000072fe.bin
2072f64847c28bb8cd98af873dcb44a80257a90bf2113ef4d6bb3acb26c3e4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 5748 bytes
font_01_sfnt_off00008682.bin
7c1d05ba35f5f9c68ec9a9689c5745ab86046a5e36a3862b5de4a93e6e02efb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8682 10164 bytes

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