Malicious PDF — malware analysis report

Static analysis result for SHA-256 19353a8d5515bdb1…

MALICIOUS

PDF

37.1 KB Created: 2020-08-19 00:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83713b2f820999b6ee51c5338605dccf SHA-1: f7ee7af6d081ae84e4a9a48642bea0ecdeccb6d9 SHA-256: 19353a8d5515bdb1dc6ad0a8f10e4f69ffd1c9b8ae8c41b686a5efb60d140b27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'the haunted mansion' and the redirector URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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.ru/pify?keyword=the+haunted+mansion+full+movie
    • http://files.hinsdalesouthathletics.org/uploads/1/3/1/3/131382700/13a1e2f1780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/483134086.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/kevin_love_injury_report_rotoworld.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0450/9813/9813/files/sc_st_obc_caste_list_in_gujarat.pdf
    • https://cdn.shopify.com/s/files/1/0437/6317/1485/files/nojowiwe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/the_apostolic_ministry_rick_joyner.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/app_development_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/brche_dividieren_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/93930115562.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/reference_letter_template_for_teaching_position.pdf
    • https://cdn.shopify.com/s/files/1/0435/3920/2207/files/vfr_navigation_log.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/94219540772.pdf
    • https://cdn.shopify.com/s/files/1/0438/3883/2800/files/mii_qr_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/zitali.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_off000051fd.bin
266c61618ea7da2307f7d8d0d0f50f4fe7856baed553ec5233133505553eb1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FD 5060 bytes
font_01_sfnt_off0000631a.bin
a306350433681dc4a6025131dcb482db2a3e3edca90d6cd2adc4921e738df754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 10788 bytes

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