Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b31665d788dff5e…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 22:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b0e989b6b95e63f77ad4d02c64d0cd SHA-1: cea26546c40c88ebf20afe8f6caaa441df6b6407 SHA-256: 0b31665d788dff5e7e481dc35d3c4778b421c01294204704c3ee11d054e723c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary purpose appears to be link farming or redirecting users to malicious sites, rather than delivering a direct exploit.

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=abou+shakra+restaurant+case+study+answer
    • http://files.leadthewayonline.com/uploads/1/3/2/7/132740498/debigilupovalejalili.pdf
    • http://files.fourarrows-ranch.com/uploads/1/3/2/6/132681556/xudejelewofili-xikevipujalox-gizikuvaguke.pdf
    • http://files.stpeterslimpsfield.org/uploads/1/3/1/6/131637219/7520145.pdf
    • http://solunetus.standbyme2019-2021.org/uploads/1/3/1/4/131407711/posoporeril_todil_wewawupariguxe.pdf
    • http://files.danielmckeon.net/uploads/1/3/1/4/131438180/7565198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/online_travel_agency_market.pdf
    • https://cdn.shopify.com/s/files/1/0433/3725/3023/files/minecraft_how_to_tp_to_coords.pdf
    • https://cdn.shopify.com/s/files/1/0439/0505/6920/files/sql_server_database_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/3915608940.pdf
    • https://cdn.shopify.com/s/files/1/0429/6087/9772/files/retikiresegubakubufok.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/chick_fil_a_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/jikupewuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0301/7378/files/65723145986.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/ganpati_atharvashirsha_meaning_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0450/1517/1236/files/80920751006.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_off0000576d.bin
69ae8a97b64d53d56f2ec8bd664a6f3150cc0a3399c10f2e1eaf3a2e41f55137
pdf-font-stream PDF embedded font (sfnt) at offset 0x576D 5384 bytes
font_01_sfnt_off000069c2.bin
847ef7b307aca71da0231a17acdf1a16af2816e3ac7e9f85c56a95c945c53633
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C2 10176 bytes