Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c45444103624ed…

MALICIOUS

PDF

50.6 KB Created: 2020-10-07 08:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f05cbc03e012a8e4c7d15472d42c6830 SHA-1: 6b283b5a8b4ce064814b827ebf8402a4d047f57d SHA-256: 21c45444103624ed75f8f776d7af4833685af410472d53003942301e8292c98d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=spielvogel+ap+euro+textbook+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or content-luring tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=spielvogel+ap+euro+textbook+pdf In 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/1/0434/1389/7372/files/64444981454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4525/9926/files/omega_rejuvenol_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0495/5293/files/69962253595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8688/8601/files/vipejiguwizeporizugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4652/9941/files/72443141593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8234/5367/files/61818427682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2912/1182/files/roblox_shark_bait_bucket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/lebimotorepujid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0337/1935/files/13823235631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7847/0817/files/24337017822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/free_psn_code_no_surveys.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/blood_cell_diagrams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1167/2733/files/fedobazitetabefubijanavil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1802/6917/files/hr_block_coupons_february_2020.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C3 7052 bytes
SHA-256: 8574aaa7177812bc736739a3ecf8b8a9ad5ea46c7951f1005f77e8516a0d7bee
font_01_sfnt_off000075dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 5464 bytes
SHA-256: 40b763c6260141cc5dcbdadc104d4011d93dd5a785b1d67e7233863f42a58869
font_02_sfnt_off00008882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 4928 bytes
SHA-256: 5eb2c1fe5f04f4bccf7210a533a69cdd32ba6d64b4521e2e9efac8451c9309e1
font_03_sfnt_off00009a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A17 10208 bytes
SHA-256: 2dca1aa03098330e3387200b618c8e25a067ba78bbdbd9d3ac4b5984a1e732b2

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