Malicious PDF — malware analysis report

Static analysis result for SHA-256 1967121e67f05a87…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 04:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac5cfd3002e644aee912ebf84dfec43c SHA-1: e233029c30d49b69f12a8822594d89a85ae1b0bf SHA-256: 1967121e67f05a87120c445df38a7e0d38a1f6bf635dcaffffbbfa9f908feada
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as a bursary opportunity. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=brampton+manor+sixth+form+bursary, which is a clear indicator of a phishing or scam attempt.

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=brampton+manor+sixth+form+bursary
    • http://sisata.isoldeetlesbens.com/uploads/1/3/1/4/131409090/1652444.pdf
    • http://pabubajow.rebeccalangston-george.com/uploads/1/3/1/4/131406515/ragomub.pdf
    • http://files.nanostitchlab.com/uploads/1/3/2/7/132740285/65804.pdf
    • http://ginizota.thegirlbehindtheface.com/uploads/1/3/1/4/131407089/tipewivazunosox_rimifevaviful_nefunaberebeni_vuzapawusiwog.pdf
    • http://files.artfulelegance.com/uploads/1/3/1/6/131606169/laxifuwewemopumiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/98666391806.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/71364405072.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/13248550415.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/automobile_engineering_book_for_diploma.pdf
    • https://cdn.shopify.com/s/files/1/0434/0121/6163/files/28516661810.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/capitalization_worksheets_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/8567344216.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/separador_de_justia_federal.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/dakenenewadabenomupojalu.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_off000062f9.bin
c02a4b88e7462240ee77a201adf834f1ef853703500fabe2a43456a2fea2393e
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5468 bytes
font_01_sfnt_off00007568.bin
588d0d2ded35cb0c52a09ff225d6ae861dff7c06766a7c151895c5da74e61d94
pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10916 bytes