Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0135e760aaf95cc…

MALICIOUS

PDF

39.2 KB Created: 2020-08-24 02:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 322ac9d2a545fa33ea71027963cc6a25 SHA-1: 504853b103b05f36e2e44727a2cc7d6018e2bfee SHA-256: a0135e760aaf95cc6e7c1c38f92062e1784572826614fc7f16672fa7fc409c2d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to Shopify domains but are designed to mask a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'ttraff.cc', which is known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, suggesting an attempt to manipulate search results or distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF. The document body contains a URL that aligns with the malicious redirector.

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=choodiyan+new+full+song
    • http://files.ntsnational.com/uploads/1/3/2/6/132695525/6805807.pdf
    • http://bavibisu.seaofqibodywork.com/uploads/1/3/1/4/131412290/bunoridevokinimefa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/89860756775.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/pst_time_zone.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1665/files/relationship_between_assessment_and_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/dabadagetunavemoxelarug.pdf
    • https://cdn.shopify.com/s/files/1/0434/3735/9271/files/roman_catholic_novena_prayers.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/65795814164.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/29326797748.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/54610103701.pdf
    • https://cdn.shopify.com/s/files/1/0428/5651/3692/files/61941991794.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/jojikiginokogeteki.pdf
    • https://cdn.shopify.com/s/files/1/0438/8513/3992/files/kaala_koothu_full_movie_isaimini.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/97104566868.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/radolizelisidezadu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/65907284342.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/agile_approach_to_project_management.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_off00005988.bin
9b1081e98827d93e1861f0092e29c639d1b7b616390c9e23af959cd1c0b2b33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5988 5172 bytes
font_01_sfnt_off00006b3b.bin
6589e9d9c2c551529fda67cb6869c6805f64630fccea9c66d55409a5ae3ce356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3B 10756 bytes

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