Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47d65747b75ef01…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56d095e6b7d11f5c5ad6f0a35ebf8be SHA-1: 4c82c27ab0cf1f8b226108b8e67bfcec93a3737d SHA-256: a47d65747b75ef010c1499718a7e32e5e6d0ceb2a1c28808789d3253af0d3279
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains. The primary malicious URL identified is https://ttraff.ru/pify?keyword=equivalent+ratios+worksheet+kuta, which likely serves as a gateway to further malicious content. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it was programmatically generated.

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=equivalent+ratios+worksheet+kuta
    • http://files.dallasemmaus.org/uploads/1/3/1/3/131398091/zoxufitubovatugobox.pdf
    • http://files.thebrainyblonde.com/uploads/1/3/2/6/132681308/966571.pdf
    • http://files.kbgamesllc.com/uploads/1/3/0/7/130775659/tegapokimapu.pdf
    • http://files.uuchurchofstockton.org/uploads/1/3/1/3/131383544/3310012.pdf
    • http://tovomalo.slatingtonbaptist.org/uploads/1/3/0/7/130775734/5922813.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3911/files/45353359647.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/77067198664.pdf
    • https://cdn.shopify.com/s/files/1/0450/8083/8309/files/biblioteca_historica_diodoro_siculo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/pobaseg.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5359/files/33515046957.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/besubomave.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8837/files/taxut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/pewixozuzobupakepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/26030759409.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5701/files/hoopp_realty_inc_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/96785568705.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/regapep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/wuzumapuroxisakunak.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/bujejefedu.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005617.bin
1ae70f491ada19aa15915b09098307dda6930608f1c2b9a4221fcf8f8eb54b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5617 5072 bytes
font_01_sfnt_off0000676e.bin
304c3ea4394cf1dcfca4975ffb72e95fc8806d27b1aca253a51204d92e6bdc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 9812 bytes

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