Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c39a48537838a7…

MALICIOUS

PDF

43.1 KB Created: 2020-08-18 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d80d5d6051450024a18e73cd02881f3 SHA-1: a2394aa8b3022847a10593593d8dee49781014b1 SHA-256: e7c39a48537838a7562b321a4a289e2eb20df03ff6db749646a3d8651cf3e168
150 Risk Score

Malware Insights

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

The PDF document contains a prominent link disguised as an admission form, which redirects to a known malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the text 'Admission form for class 11 in guwahati' and the malicious URL, reinforcing the lure.

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.ru/pify?keyword=admission+form+for+class+11+in+guwahati
    • http://siraw.topraise.org/uploads/1/3/1/0/131070450/wetisozijoxise.pdf
    • http://files.katoutofbag.com/uploads/1/3/2/3/132303374/65cae.pdf
    • http://files.suareztogo.com/uploads/1/3/1/3/131398455/fegudubu-sumidemit-fupojudojador-rimuwa.pdf
    • http://xinaniro.crstakers.org/uploads/1/3/1/3/131383544/e3888e1668f27e8.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/laporan_pendahuluan_fraktur_antebrachii.pdf
    • https://cdn.shopify.com/s/files/1/0430/9109/9805/files/19287605738.pdf
    • https://cdn.shopify.com/s/files/1/0431/0437/0842/files/dvd_electoral_dysfunction_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/assam_tet_question_paper_assamese_medium.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/mapajadotutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/kedemuwanixerewut.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/lodowamikaseneji.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/tarutubezanajul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/cost_accounting_past_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3305/8715/files/lawyer_business_card_psd_free.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_off0000689a.bin
ed141226d8ed0cf75174283d754bb90fe4693c6a631ad783893050c7abd5f61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 5568 bytes
font_01_sfnt_off00007b6a.bin
bd7a802375642b76ad0c7f292fe2d5259b692c71ecdf564fb3e0d685b242240b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6A 10700 bytes

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