Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f55b156103c4c3…

MALICIOUS

PDF

40.1 KB Created: 2020-08-04 02:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a274d73673b564990ce03082225eef07 SHA-1: ff8428f3e2152fe04eabfbffec458dfb0f2e88f2 SHA-256: 45f55b156103c4c36d3ea75b1ddd3c56f3649e619bf3a4979e6fafb042504cb2
150 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on Shopify, likely for SEO poisoning. The primary malicious link, https://ttraff.ru/pify?keyword=l+article+contract%25C3%25A9+exercices+pdf, is a known malicious redirector. The document body itself is heavily obfuscated and appears to be a lure related to 'contract exercises'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=l+article+contract%25C3%25A9+exercices+pdf
    • http://files.artspark.com/uploads/1/3/1/6/131636954/pugemafobex_kikesakikabuw_jivabujurate_fipofijijog.pdf
    • http://files.chelseanswagner.com/uploads/1/3/1/4/131437848/kexeji-bukalukujorun-bemeb-tuzanafebol.pdf
    • http://files.southwesterngmtc.com/uploads/1/3/1/8/131857315/subazevironarag.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/86676284595.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/61608091067.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/72333427954.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/58742503012.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/sakabawixevomavaxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/54644833847.pdf
    • https://cdn.shopify.com/s/files/1/0428/3724/6118/files/ribaposutarilejeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/zapesobukaxaguwunadan.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/lurux.pdf
    • https://cdn.shopify.com/s/files/1/0429/0271/6572/files/mitosis_and_meiosis_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/stihl_battery_weed_eater.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_off00005be9.bin
598e0d3dd1131bfd212a3de8595ac156a2f8d735d30684dcc81b22b040f56ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 5300 bytes
font_01_sfnt_off00006dc5.bin
21dc07734ac0267c7461142411a5e09c5dc432eee2b43bcb96ae1081db0fc934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 10592 bytes

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