Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee01b52f010457d3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-14 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0579a984bec137708b684f41e946e85 SHA-1: 840e2e5980b8dba9fbbc8a85258bda0c3fc7bab0 SHA-256: ee01b52f010457d302be01aba2d3a79bd52ffc8695c8083f8d8db9d9fd4f70fd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to `https://ttraff.cc/pify?keyword=inpatient+rehabilitation+quality+reporting+program`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, reinforcing the lure.

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.cc/pify?keyword=inpatient+rehabilitation+quality+reporting+program
    • http://files.artypantsstudiott.com/uploads/1/3/0/7/130775229/wumoze.pdf
    • http://files.charterschoolwatchdog.com/uploads/1/3/1/0/131071312/9f24baa9.pdf
    • http://files.savetheearth.info/uploads/1/3/0/8/130814605/92f73bcc83d66.pdf
    • http://files.bouvardtavern.com/uploads/1/3/1/4/131453251/fuxaxok_fololube_lulid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/battle_for_middle_earth_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/9244680138.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/8621583381.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/26882056010.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/17722422170.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/54373923047.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/junatadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/assurance_wireless_application_virginia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/unir_dos_en_linea_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006256.bin
06c34b2c4c86f1cfb9dd4c3b8e4e7eda92eac9b4b7d3da757e5cb76775b2af17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 5240 bytes
font_01_sfnt_off000073f2.bin
8c717e876948e885251dd6086c4c000d01f106948defecb670778445412b2c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F2 10408 bytes
font_02_sfnt_off00009780.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 4324 bytes

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