Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1113e53ad9cb34…

MALICIOUS

PDF

44.1 KB Created: 2020-08-12 21:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64c03c947eb10966003c3f7565e7ac7 SHA-1: 5a350402aef162534b2da661e9c4eee2764a5c6d SHA-256: ff1113e53ad9cb347c44a990a94a24072a29d0aca1c5d4834d51c1e3da81ab99
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a buttock pain exercise PDF. It also features a link farm pointing to numerous other PDFs, many hosted on Shopify. The primary malicious URL, 'https://ttraff.com/pify?keyword=buttock+pain+exercises+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the attack pattern.

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=buttock+pain+exercises+pdf
    • http://benaderu.lostacresresort.com/uploads/1/3/2/6/132681647/bapibakeboxuxivaxalu.pdf
    • http://files.mistergteacher.com/uploads/1/3/0/8/130873997/ea1710b61be90.pdf
    • http://files.careloomkits.com/uploads/1/3/2/3/132303035/6353085.pdf
    • http://files.growingthroughlosstcsouth.com/uploads/1/3/1/3/131398253/65e8afe2.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/english_grammar_tenses_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6383/files/examples_of_alkanes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/46198640653.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/brinell_hardness_test_machine.pdf
    • https://cdn.shopify.com/s/files/1/0437/2240/8087/files/amharic_bible_names.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/xitonewas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/blackhawks_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/highlight_on_macbook_pro.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/tuzedudegezazudoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/ccdc_contracts.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/episteme_definicion.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_off00006efd.bin
28016baec46075981d398a702659aaa17589ecb23efdae911ed7acf74d9d9a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 5296 bytes
font_01_sfnt_off00008114.bin
6ea64d782d4fff8975236ae8fb2b7f94fab87c6b9a25ab50a0408d8ae892d670
pdf-font-stream PDF embedded font (sfnt) at offset 0x8114 10412 bytes