Malicious PDF — malware analysis report

Static analysis result for SHA-256 0142953cc9c6e8fb…

MALICIOUS

PDF

51.5 KB Created: 2020-08-19 18:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b848a6d670fcdd0483c09b8278b22f97 SHA-1: 0c09dff50f487a51f2cb2cba10dd042db0415a0d SHA-256: 0142953cc9c6e8fbc0a44a9dd9956d96ca1a5b6ffd5f1bcc56fc73d61ced6e2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'Borderlands 3 skill tree guide'. This link, 'https://ttraff.cc/pify?keyword=amara+borderlands+3+skill+tree+guide', points to known malicious infrastructure. The document also features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=amara+borderlands+3+skill+tree+guide
    • http://fafig.johnsom.com/uploads/1/3/1/6/131606490/godemumisa_noxobifafev_xotefe_muxeneroxusopij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/91179430593.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/48547766079.pdf
    • https://cdn.shopify.com/s/files/1/0452/2462/4288/files/pdf_to_word_doc_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/0227/7542/files/busyworksbeats_music_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/ketakanaxatag.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/39196058861.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/68836937444.pdf
    • https://cdn.shopify.com/s/files/1/0438/4335/4781/files/october_2020_calendar_kalnirnay.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zejakepujubuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/padatoliterevuzeminotukew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e5c.bin
133899f9b521460b37dbc3192c9c93077cb7bdc30a16d08f8a4f69c4753bf3ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5C 5384 bytes
font_01_sfnt_off0000908d.bin
e266af091a0e96276eae91987b00304ac9ac9c78b97617f74902813d065f5c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x908D 10180 bytes
font_02_sfnt_off0000b36c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 4324 bytes