Malicious PDF — malware analysis report

Static analysis result for SHA-256 219ef871a2de40bd…

MALICIOUS

PDF

36.4 KB Created: 2020-08-26 19:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341bbf9d97faee5f08eecd53c7973e61 SHA-1: 701fdfd98de8d5850534ab4fb5826f1fbc94552d SHA-256: 219ef871a2de40bd4d4530ee5453e7aebf8b2764036fc905af27ba70fee561c9
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs that point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=exploring+british+culture+jo+smith+p', suggesting an attempt to lead users to malicious content. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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=exploring+british+culture+jo+smith+p
    • http://files.centralwindsmewe.com/uploads/1/3/0/7/130739704/vabazuvefabaj.pdf
    • http://files.rockdogltd.com/uploads/1/3/1/4/131453821/750e6a42.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2085/files/24742566277.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/78255007795.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/80319953988.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/valevubemojobaparun.pdf
    • https://cdn.shopify.com/s/files/1/0449/1404/9191/files/shakespearean_sonnet_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/nizijofamonadavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/zuzolasokavurarezosewaliv.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/xiligolelunixonovit.pdf
    • https://cdn.shopify.com/s/files/1/0434/2723/3954/files/40381523805.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/75164294426.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/77464392466.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_off0000447b.bin
72951a44589491d3e3e355785514749d006be74c95287c7e83c86310e6d53c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x447B 5260 bytes
font_01_sfnt_off00005640.bin
a3210c5b5d9b00e38eab4efefbfe65d0e2d62dbbb092484057e3e79c9a18bde9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5640 9468 bytes
font_02_sfnt_off000076b4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B4 4324 bytes