Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8e5de293e4591e…

MALICIOUS

PDF

36.7 KB Created: 2020-08-25 13:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cc92754a1fe345fccbe04da8c3ab565 SHA-1: c338e3888929f3c0b03d90bc6ea41c26d4b10cf9 SHA-256: 1d8e5de293e4591e6941390bc66aac23fd86990d74997d8712566823217eeb94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a malicious redirector link disguised as an educational worksheet. The primary malicious URL, https://ttraff.com/pify?keyword=indefinite+pronouns+worksheet+for+grade+3+pdf, is designed to redirect users to further malicious content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for 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.com/pify?keyword=indefinite+pronouns+worksheet+for+grade+3+pdf
    • http://files.nothingbutxmas.com/uploads/1/3/0/7/130738969/xumosun.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/49345773534.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/free_printable_calendar_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/70924976741.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/dowuwavefifularomogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/formasi_cpns_belitung_timur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/48431806113.pdf
    • https://cdn.shopify.com/s/files/1/0437/7119/9642/files/recursive_binary_search.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/zafeditodokux.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_off000050f3.bin
c64c02eb6fde8eb026d4e30997072d32e83248a83a66b8047ad09ed4fcd1495a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F3 5528 bytes
font_01_sfnt_off000063c9.bin
36d2b336165ccb5c55a4f3eed4d2d85c602a62a8fcf4037a4368fc0fba7f7d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 10160 bytes

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