Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32e94f827efdd8c…

MALICIOUS

PDF

41.5 KB Created: 2020-10-04 10:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7342381774683329a1179d0851793483 SHA-1: fdd9fb4c48b0521d0b7e9c32c51daf0802da5a3c SHA-256: a32e94f827efdd8cc33b54ee2c988723c14acf668de4337a5f131f84e21c95e5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/strik?keyword=4-+3+practice+congruent+triangles+worksheet+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but likely serve to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the redirector strongly suggest a phishing or malware delivery attempt.

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://cctraff.ru/strik?keyword=4-+3+practice+congruent+triangles+worksheet+answers In PDF document text
    • http://gajurom.justsayin.ca/uploads/1/3/0/9/130969204/getose-binoje-wapofasok.pdfIn PDF document text
    • http://files.brendasbrushstrokesandbisque.com/uploads/1/3/1/6/131606492/fijelumadafonuran.pdfIn PDF document text
    • http://jefosafeb.khoueiryrealestate.com/uploads/1/3/1/4/131452836/dofewarofu.pdfIn PDF document text
    • http://files.sourisdistrictarts.com/uploads/1/3/2/7/132712415/7e7495746.pdfIn PDF document text
    • http://files.crosstekco.com/uploads/1/3/1/3/131379037/a9568aea1a5402.pdfIn PDF document text
    • http://fatokujat.andreacook.net/uploads/1/3/0/7/130739897/xoxowago-feboweg-suputuxamuris-xiwoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/82833549514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2286/6837/files/puxatimodagimijaxavux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/51840281829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1553/8341/files/hematologic_system_ati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0856/7707/files/download_unmatched_air_traffic_control_cheat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9359af-a065-4f84-a021-6d484485e113/43486433400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b69a4a-cc48-4340-8bc1-92cf7b5a8137/43798535366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbaed8f-6cb5-4460-b712-ac9f858ecdc5/45086823774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4341b6be-986e-4a27-9898-277cea8ff743/wefazemanefusozeja.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 5540 bytes
SHA-256: 81d80a3f3745f401911bb99c8c16de9b087dfffd7a99b4effbeaecae43ec7826
font_01_sfnt_off00007661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 10000 bytes
SHA-256: 3837684955249f80fb657f2e6fc5354c15eda5edc13c9ad5c0974e416f085dfc

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